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Bi 1.Quy lut phn li - 1Cu 1 Alen l

A cc trng thi khc nhau ca cng mt kiu gen vi mt trnh tnucltit cth.B cc trng thi khc nhau ca cng mt gen vi mt trnh tnucltit cth.C cc trng thi biu kiu hnh khc nhau ca cng mt kiu gen.D cc kiu thp khc nhau ca cc gen, to nn cc kiu hnh khc nhau.

Cu 2 Lcus l

A l vtr ca phn tADN trn nhim sc th.B l vtr m cc gen c thtin hnh qu trnh phin m.C l vtr m prtin c chtng tc vi gen.D vtr ca gen trn nhim sc th.

Cu 3 Trc khi tin hnh lai Menen tin hnh to ra dng thun chng bng cchA cho giao phi gia cc c ththuc 2 dng sau tin hnh chn lc.B cho cy tthphn qua nhiu thhsau tin hnh chn lc.C cho giao phi gia cc c ththuc 2 dng sau tin hnh tphi.D cho giao phn gia cc c ththuc 2 dng sau tin hnh tthphn.

Cu 4 Phng php nghin cu di truyn ca Menen lA tp giao gia cc c thlai to ra kiu hnh mi.B lai gia cc c ththuc cc dng thun v phn tch c thlaiC cho c thlai tthphn qua nhiu thhri tin hnh phn tch.D cho giao phi gia con lai vi b, mca chng ri tin hnh phn tch.

Cu 5 Cc ni dung trong phng php nghin cu di truyn ca Menen l:(1) Sdng ton xc sut phn tch kt qulai. (2) Lai cc dng thun v phn tch kt quF1, F2, F3.(3) Tin hnh th nghim chng minh. (4) To cc dng thun chng bng cch cho tthphn.Trnh tcc bc l

A (1), (2), (3), (4).B (4), (2), (1), (3).

C (4), (3), (2), (1).

D (4), (1), (2), (3).

Cu 6 Theo Men en tnh trng c quy nh biA gen.

B alen

C nhn tdi truyn.D gen hay alen.

Cu 7 c im m phng php nghin cu di truyn ca Menen khng c lA cho tthphn qua nhiu thhthu c nhng dng thun trc khi tin hnh lai.B lai cc dng thun chng khc bit nhau bi mt hoc nhiu tnh trng ri phn tch kt qui con.C cng mt lc theo di sdi truyn ca tt ccc cp tnh trng ca c thbm.D sdng ton xc sut phn tch kt qulai, sau a ra githuyt gii thch kt qu.

Cu 8 C thmang kiu gen Aa khi gim phn bnh thng cho tlgiao tmi lA 75% A : 25% a.

B 75% a : 25 % A.

C 50% A : 50 % a.

D 50% AA : 50% aa.

Cu 9 c chua, gen A quy nh qutri hon ton so vi alen a quy nh quvng. Php lai no sauy cho F1 c tlkiu hnh l 3 qu: 1 quvng?A AA aa.

B Aa aa.

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C Aa Aa.

D AA Aa.

Cu 10 Cho A quy nh qutri hon ton so vi a quy nh quxanh. Cho hai cy thun chng quv quxanh lai vi nhau. Tlkiu gen phn li F2 slA 3 AA : 1 aa.

B 2 AA : 1 Aa : 1 aa.

C 1 AA : 1 Aa : 2 aa.

D 1 AA : 2Aa : 1aa.

Cu 11 u h lan, ht trn l tri hon ton so vi ht nhn. Trung bnh mi quu c 6 ht. Nu chocc ht trn dhp ttthphn th tltrong cc quu tt ccc ht u nhn l:A 3/4.

B 1/4.

C (3/4)6.

D (1/4)6.

Cu 12 Cho giao phn gia cy c chua quthun chng vi cy quvng thu c F1 100% cy choqu, cho cy F1 tthphn th kiu hnh F2 l 3/4 cy cho qu: 1/4 cy cho quvng. Cch lai no

sau y khng xc nh c kiu gen ca cy hoa F2?A Lai cy hoa F2 vi cy quvng P.B Lai cy hoa F2 vi cy quF1.C Cho cy hoa F2 tthphn.D Lai cy hoa F2 vi cy quP.

Cu 13 ngi gen A qui nh mt nu tri hon ton so vi gen a quy nh mt xanh. Gen quy nh tnhtrng mu mt nm trn cp NST thng. Mt gia nh bv mu mt nu sinh ra mt a con c mtmu xanh. Kiu gen ca bmslA AA.

B aa.C bAa, maa.D Aa.

Cu 14 Menen rt ra kt lun khi lai hai c thbmthun chng khc nhau vmt cp tnh trng lthhthnht sA ng tnh vtnh trng ln, tnh trng khng biu hin gi l tnh trng tri.B phn li kiu hnh theo tl1 kiu hnh tri v 1 kiu hnh ln.C ng tnh ging mt bn, tnh trng c biu hin gi l tnh trng triD phn li kiu hnh theo tl3 kiu hnh tri v 1 kiu hnh ln.

Cu 15 Theo Menen trong tbo cc nhn tdi truyn tn tiA thnh tng cp nhng ho trn vo nhauB thnh tng cp v khng ho trn vo nhau.C ring lv khng ho trn vo nhau.D thnh tng cp hay ring ltuvo mi trng sng.

Cu 16 C stbo hc ca quy lut phn li l doA c sphn ly c lp v thp tdo ca cc cp alen quy nh cc cp tnh trng khi cp nhim sc

thmang cp alen phn li v thp trong qu trnh phn bo.B c sphn ly c lp v thp tdo ca cp alen quy nh cp tnh trng khi cp nhim sc thmang

cp alen phn li v thp trong qu trnh phn bo.

C c sphn ly c lp v thp tdo ca cc alen quy nh cc tnh trng khi cp nhim sc thmangcp alen phn li v thp trong qu trnh phn boD c sphn ly c lp v tc ng tng hp ca cc alen quy nh cc tnh trng khi cp nhim sc th

mang cp alen phn li v thp trong qu trnh phn bo.

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Cu 17 Menen tm ra qui lut phn li trn c snghin cu php laiA hai cp tnh trng.B mt cp tnh trng.C mt hoc nhiu cp tnh trng.D nhiu cp trng.

Cu 18 Menen gii thch quy lut phn li bngA sphn li c lp thp tdo ca cp alen.B sphn li c lp, thp tdo ca cp gen.C githuyt "giao tthun khit".D hin tng tri ln hon ton

Cu 19 Mu lng tru do 1 gen quy nh. Mt tru c trng (1) giao phi vi mt tru ci en (2) lnthnht mt ngh trng (3), ln thhai mt ngh en (4). Con ngh en ln ln giao phi vi mt truc en (5) sinh ra mt ngh trng (6). Kiu gen ca 6 con tru trn lA (1), (3), (6) ng hp tln; (2), (4), (5) dhp t.B (1), (2), (3) ng hp tln; (4), (5), (6) dhp t.C (1), (3), (5) ng hp tln; (2), (4), (6) dhp t.

D (4), (5), (6) ng hp tln; (1), (2), (3) dhp t.Cu 20 u H Lan, ht vng l tri hon ton so vi ht xanh. Cho rng ht thhF1 (kiu hnh F1)nm trn cy P; ht F2 nm trn cy F1 ; ht F3 nm trn cy F2. Cho cy ht vng thun chng giao phnvi cy ht xanh, tlkiu hnh trn cy F1 l:A 3 vng : 1 xanh.

B 1vng : 1 xanh.

C 5 vng : 3 xanh.

D 100% ht vng.Cu 21 u H Lan, gen A quy nh thn cao tri hon ton so vi alen a quy nh thn thp. Cho cy

thn cao giao phn vi cy thn cao, thu c F1 gm 900 cy thn cao v 299 cy thn thp. Tnh theo lthuyt, tlcy F1 tthphn cho F2 gm ton cy thn cao so vi tng scy F1 lA 1/2.

B 3/4.

C 2/3.

D 1/4.

Cu 22 Xt mu sc loi hoa do ba alen quy nh, alen A quy nh hoa tri hon ton so vi alen a quynh hoa hng v alen a1 quy nh hoa trng, trong alen a tri hon ton so vi alen a1. Ngi ta em laigia cy hoa lng bi vi cy hoa hng lng bi c F1 xut hin cy hoa trng. Hi skiu genkhc nhau c thc c thF1 lA 3

B 4

C 5

D 6

Cu 23 mt loi sinh vt, kiu gen DD quy nh qutrn, Dd quy nh qubu dc, dd qudi. Cho cyc qutrn giao phn vi cy c qubu dc th kt quthu c lA 50% qutrn : 50% qudi.B 50% qubu dc : 50% qudi.C 50% qutrn : 50% qubu dc.

D 100% qutrn.Cu 24 mt loi u, tnh trng ht nu do gen B quy nh l tri hon ton so vi tnh trng ht trng dogen b quy nh. Cho u ht nu giao phn vi u ht nu, F1 thu c 601 ht nu : 199 ht trng. Kiugen ca P l

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A Bb Bb.

B BB BB.

C BB Bb.

D Bb bb.

Cu 25 Cho bit gen A quy nh hoa tri hon ton so vi gen a trng, sc sng ca giao tmang gen Agp i giao tmang gen a. Bv mu mang kiu gen dhp th tlhoa trng so vi hoa i conF1 sl ?A 6,25%.

B 12,5%.

C 6,67%.

D 25%.

Cu 26 mt loi sinh vt lng bi (2n), xt gen c 3 alen A ; B v C. Skiu gen ti a c thc vgenni trn l

A 3

B 6

C 15

D 9Cu 27 mt loi sinh vt lng bi (2n), xt gen c 4 alen A1, A2, A3, A4. Skiu gen dhp ti a cthc vgen ni trn lA 4

B 10

C 6

D 9

Cu 28 mt loi sinh vt lng bi (2n), xt gen c 5 alen A1, A2, A3, A4, A5. Skiu gen ti a c thc vgen ni trn l

A 5B 10

C 15

D 32

Cu 29 Xt mu sc loi hoa do ba alen quy nh, alen A quy nh hoa tri hon ton so vi alen a quynh hoa hng v alen a1 quy nh hoa trng, trong alen a tri hon ton so vi alen a1. Ngi ta em laigia cy hoa lng bi vi cy hoa hng lng bi c F1 xut hin cy hoa trng. Tlphn li kiuhnh c thF1 lA 3 : 1.

B 1 : 2 : 1

C 1 : 1 : 1 : 1.

D 1 : 1.

Cu 30 mt loi sinh vt, kiu gen DD quy nh qutrn, Dd quy nh qubu dc, dd qudi. Cho cyc qubu dc giao phn vi cy c qubu di th kt quthu c lA 50% qutrn : 50% qudi.B 50% qubu dc : 50% qudi.C 50% qutrn : 50% qubu dc.D 100% qutrn.

Cu 31 mt loi u, tnh trng hoa do gen A quy nh l tri hon ton so vi tnh trng hoa trng do

gen a quy nh. Cho u hoa giao phn vi u hoa trng, F1 thu c 201 ht nu : 199 ht trng. Kiugen ca p lA Aa Aa.

B AA aa.

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C Aa Aa.

D Aa aa.

Cu 32 u H Lan, alen A quy nh thn cao tri hon ton so vi alen a quy nh thn thp. Cho cythn cao thun chng giao phn vi cy thn thp, thu c F1. Cho cc cy F1 tthphn thu c F2.Tip tc cho cc cy F2 tthphn thu c F3. Bit rng khng xy ra t bin, theo l thuyt, tlphn likiu hnh F3 l:A 5 cy thn cao : 3 cy thn thpB 3 cy thn cao : 5 cy thn thp.C 3 cy thn cao : 1 cy thn thp.D 1 cy thn cao : 1 cy thn thp.

Cu 33 mt loi thc vt, hoa (A) l tri hon ton so vi hoa trng (a). Cho P thun chng khc nhauvcp tnh trng lai vi nhau c F1. Cho cc cy F1 giao phi ngu nhin th c F2 c tlc thmang tnh trng ln chim:A 6,25% hoc 25%.B 18,75%.

C 6,25%.

D 25%.Cu 34 Kiu gen ca c chp khng vy l Aa, c chp c vy l aa. Kiu gen AA lm trng khng n. Tnhtheo l thuyt, php lai gia cc c chp khng vy scho tlkiu hnh i con lA l c chp khng vy : 2 c chp c vy.B 3 c chp khng vy : l c chp c vy.C 100% c chp khng vy.D 2 c chp khng vy : l c chp c vy

Cu 35 mt loi thc vt, alen A quy nh hoa tri hon ton so vi alen a quy nh hoa vng. Cho cy(P) c kiu gen Aa tthphn thu c F1; tip tc cho cc cy F1 tthphn thu c F2. Bit rng

khng c t bin xy ra, scy con c to ra khi cc cy F1 tthphn l tng ng nhau. Tnh theol thuyt, cy c kiu hnh hoa F2 chim tlA 37,5%.

B 50,0%.

C 75,0%.

D 62,5%.

Cu 36 u H Lan, alen A quy nh hoa tri hon ton so vi alen a quy nh hoa trng. Cho cy hoathun chng lai vi cy hoa trng (P), thu c F1. Cho cy F1 tthphn, thu c F2. Tnh theo lthuyt, trong scc cy hoa F2, cy thun chng chim tlA 25%.

B 33,33%.

C 66,67%.

D 75%.

Cu 37 u H Lan, gen A quy nh thn cao tri hon ton so vi alen a quy nh thn thp. Cho cythn cao giao phn vi cy thn cao, thu c F1 gm 900 cy thn cao v 299 cy thn thp. Tnh theo lthuyt, tlcy F1 tthphn cho F2 gm ton cy thn cao so vi tng scy F1 lA 3/4.

B 2/3.

C 1/4.

D 1/2.Cu 38 mt loi thc vt, alen B quy nh hoa tri hon ton so vi alen b quy nh hoa trng. Trongmt php lai gia cy hoa thun chng vi cy hoa c kiu gen Bb, i con thu c phn ln cccy hoa v mt vi cy hoa trng. Bit rng sbiu hin mu sc hoa khng phthuc vo iu kin mi

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trng, khng xy ra t bin gen v t bin cu trc nhim sc th. Cc cy hoa trng ny c thl thtbin no sau y?

A Thmt.B Thba.C Thkhng.D Thbn.

Cu 39 Ni dung no sau y khng phi l phng php lai v phn tch c thlai ca Menen?A To dng thun chng vtng tnh trng bng cch cho cy tthphn qua nhiu thh.B xut phng php lp bn di truyn ca cc gen trn mt nhim sc th.C Lai cc dng thun chng khc bit nhau bi mt hoc nhiu tnh trng ri phn tch kt qulai i

sau.

D Sdng ton xc sut phn tch kt qulai sau a ra githuyt gii thch kt qu.Cu 40 Nhn nh no sau y khng phi l phng php lai v phn tch c thlai ca Menen?A To dng thun chng vtng tnh trng bng cch cho cy tthphn qua nhiu thh.B Lai cc dng thun chng khc bit nhau bi mt hoc nhiu tnh trng ri phn tch kt qulai i

sau.

C dng ton xc sut phn tch kt qulai sau a ra githuyt gii thch kt quD Gii thch ti sao tlphn ly kiu hnh i con biu hin khng u hai gii.

Cu 41 ngi nhm mu A, B, O do 3 gen alen IA, IB, IO quy nh, nhm mu A c quy nh bi cckiu gen IAIA, IAIO, nhm mu B c quy nh bi cc kiu gen IBIB, IBIO, nhm mu O c quy nh

bi kiu gen IOIO , nhm mu AB c quy nh bi kiu gen IAIB. Hn nhn gia bv mc kiu gennh thno scho con ci c 4 loi nhm mu?A IAIO v IAIB

B IBIO v IAIB

C IAIB v IAIB

D IAIO v IBIOCu 42 C hai chem gi mang nhm mu khc nhau l AB v O. Cc c gi ny bit r ng b ngoi hu l nhm mu A. Kiu gen tng ng ca bv mca cc c gi ny l:A IBIO v IAIO

B IAIO v IBIO

C IBIO v IBIO

D IOIO v IAIO

Cu 43 Mt ngi n ng mang nhm mu A v mt phnmang nhm mu B c thc cc con vinhng kiu hnh no?A chc A hoc BB AB hoc OC A, B, AB hoc OD A, B hoc O

Cu 44 Hai chem sinh i cng trng. Chly chng nhm mu A sinh con nhm mu B, em ly chngnhm mu B sinh con nhm mu A. Nhm mu ca hai chem sinh i ni trn ln lt lA Nhm AB v nhm AB

B Nhm B v nhm A

C Nhm A v nhm B

D nhm B v nhm O

Cu 45 Mt i tn hn u c nhm mu AB, xc xut a con u lng ca hl con gi mang nhmmu A hoc B lA 6,25%.

B 12,5%.

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C 25%.

D 50%.

Cu 46 Bv mu c kiu gen dhp Aa. Bit gen A quy nh tnh trng tri, alen a quy nh tnh trngln. Xc sut c c ng 3 ngi con c kiu hnh tri trong mt gia nh c 4 ngi con lA 9/64.

B 81/256.

C 27/64.

D 27/256.

Cu 47 ngi gen A quy nh tc xon tri hon ton so vi a quy nh tc thng. Mt cp vchng uc tc xon sinh c ngi con thnht c kiu hnh tc thng. Xc sut cp vchng ny sinh ngicon thhai c tc xon v c kiu gen ng hp lA 25%.

B 75%.

C 50%.

D 100%.

Cu 48 mt loi u, tnh trng ht vng do gen A quy nh l tri hon ton so vi tnh trng ht xanh do

gen a quy nh. Cho u ht vng thun chng giao phn vi u ht xanh, thu c F1. Cho cc c thF1thphn vi nhau thu c F2. Ly ngu nhin hai cy ht vng F2 giao phn vi nhau. Xc nh tlxut hin ht xanh i F3.A 1/4.

B 1/2

C 1/9.

D 1/16

Cu 49 Bn cht quy lut phn li ca Menen l sphn liA ng u ca cc alen vcc giao ttrong qu trnh gim phn.

B kiu hnh F2 theo tl3 : 1.C kiu hnh F2 theo tl1 : 1 : 1 :1.D kiu hnh F2 theo tl1 : 2 : 1.

Cu 50 Yu tdi truyn nguyn vn tbmsang con lA alen

B kiu gen.C tnh trng.D kiu hnh.

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Bi 2.Quy lut phn li - 2Cu 1 Menen sdng php lai phn tch trong th nghim ca mnh A xc nh quy lut di truyn chi phi tnh trng.B kim tra kiu gen nhng c thmang kiu hnh tri.C xc nh mt tnh trng l tri hay ln.D xc nh c ththun chng chun bcho cc php lai.

Cu 2 Php lai no sau y l php lai phn tch?A Php lai gia c thmang tnh trng tri vi c thmang tnh trng ln.B Php lai gia c thmang tnh trng tri vi c thmang tnh trng tri.C Php lai gia c thmang tnh trng ln vi c thmang tnh trng ln.D Php lai gia c thc kiu gen dhp vi c thc kiu gen ng hp tri.

Cu 3 Mun xc nh tnh trng tri c thun chng hay khng, ngi ta dng phng phpA lai phn tch, tc l cho c thc tnh trng tri lai vi c thc tnh trng lnB lai phn tch, tc l cho c thc tnh trng tri lai vi c thc tnh trng tri.C lai xa, tc l cho c thc tnh trng tri lai vi c thkhc loi.D giao phi gn, tc l cho c thc tnh trng tri tthphn hoc giao phi cn huyt.

Cu 4 Cho cc php lai : I : Aa x aa ; II : Aa x Aa ; III : AA x aa ; IV : AA x Aa ; V : aa x aa.

Php lai phn tch l

A I, III.

B I, V.

C II, III

D IV, V.

Cu 5 Qui lut phn li khng nghim ng trong iu kinA gen qui nh tnh trng dbt bin do nh hng ca iu kin mi trng.B bmthun chng vcp tnh trng em lai.

C slng c ththu c ca php lai phi ln.D alen tri phi tri hon ton.

Cu 6 kim tra githuyt ca mnh, Menen lm th nghim gi l php lai phn tch. C ngha lA lai hai c thmang tnh trng bt k vi nhau.B lai mt c thmang tnh trng tri vi mt c thmang tnh trng ln.C lai mt c thmang tnh trng tri vi mt c thmang tnh trng tri.D lai mt c thmang tnh trng ln vi mt c thmang tnh trng ln.

Cu 7 u H Lan, alen A quy nh thn cao tri hon ton so vi alen a quy nh thn thp. Cho cythn cao thun chng giao phn vi cy thn thp, thu c F1. Cho cc cy F1 tthphn thu c F2.Tip tc cho cc cy F2 tthphn thu c F3. Bit rng khng xy ra t bin, theo l thuyt, tlphn likiu hnh F3 l:A 5 cy thn cao : 3 cy thn thpB 3 cy thn cao : 5 cy thn thp.C 3 cy thn cao : 1 cy thn thp.D 1 cy thn cao : 1 cy thn thp.

Cu 8 c c dc, gen A qui nh hoa tm tri hon ton vi gen a qui nh hoa trng. Cy tam nhimAAa lai vi cy cng kiu gen, giao tlng bi khng thtinh c. Kiu hnh ca i con c thlA 8 tm : 1 trng.B 9 tm : 7 trng.

C 27 tm : 1 trng.D 17 tm : 1 trng.

Cu 9 c chua, gen A qui nh tnh trng qutri hon ton so vi gen a qui nh tnh trng quvng.Cho 2 cy c chua tbi c kiu gen Aaaa v AAaa giao phn vi nhau, kt quphn tnh i lai l

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A 11 : 1 vng.B 33 : 3 vng.C 27 : 9 vng.D 3 : 1 vng.

Cu 10 mt loi thc vt, gen A quy nh tnh trng hoa , a quy nh tnh trng hoa trng. thtbi,khi gim phn to c loi giao t2n c khnng thtinh. Cho c thc kiu gen AAaa tthphn, tlkiu hnh thhtip theo lA 35 hoa : 1 hoa trngB 11 hoa : 1 hoa trngC 5 hoa : 1 hoa trngD 3 hoa : 1 hoa trng.

Cu 11 mt loi thc vt, A- quchn sm, a- quchn mun. em lai gia cc dng cy tbi vi nhauc F1. Mun ngay F1 chxut hin 1 loi kiu hnh th c bao nhiu php lai cho kt qutrn?A 10

B 5

C 9

D 4Cu 12 c c dc, gen A qui nh hoa tm tri hon ton vi gen a qui nh hoa trng. Cy tam nhimAaa lai vi cy cng kiu gen, giao tlng bi khng thtinh c. Kiu hnh ca i con c thlA 5 tm : 4 trng.B 9 tm : 7 trng.C 27 tm : 1 trng.D 17 tm : 1 trng.

Cu 13 iu kin khng ng trong php lai mt cp tnh trng, cho F2 c tlphn li kiu hnh l 3 tri: 1 ln l

A thhxut pht phi thun chng.B sc thphn tch phi ln.C tri - ln phi hon ton.D tnh trng tri ln khng hon ton.

Cu 14 L do dn n skhc nhau vkiu hnh ca F1, F2 trong trng hp tri hon ton v tri khnghon ton l:

A Do tc ng ca mi trng khng thun li.B Do nh hng ca gii tnh.C Khnng gen tri ln t gen ln.D nh hng ca tbo cht ln sbiu hin ca gen nhn.

Cu 15 c chua, gen A quy nh qutri hon ton so vi gen a quy nh quvng. Cy c chua tbiquthun chng giao phn vi cy tbi quvng c F1. F1 c kiu gen (KG), kiu hnh (KH) v tlcc loi giao t(TLGT) l:A KG: Aaaa; KH: qu; TLGT: 3/6 Aa, 3/6 aa.B KG: AAaa; KH: qu; TLGT: 1/6 AA, 4/6 Aa, 1/6 aa.C KG: AAAa; KH: qu; TLGT: 3/6 AA, 3/6 Aa.D KG: Aaaa; KH: qu; TLGT: 1/6 AA, 4/6 Aa, 1/6 aa.

Cu 16 mt loi thc vt, gen A quy nh tnh trng hoa tm l tri hon ton so vi gen a quy nh tnhtrng hoa trng. Thtbi to giao t2n c khnng sng. Tlkiu hnh thhlai khi cho AAAa tth

phn lA 35 cy hoa tm : 1 cy hoa trng.B 3 cy hoa tm : 1 cy hoa trng.C 100% cy hoa tm.

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D 11 cy hoa tm : 1 cy hoa trng.Cu 17 mt loi thc vt, thtbi to giao t2n c khnng sng. Tlkiu gen thhlai khi choAaaa tthphn lA 1 AAaa : 4 Aaaa : 1 aaaa.

B 1 AAAA : 8 AAAa : 18 AAaa : 8 Aaaa : 1 aaaa.

C 1 AAAA : 5 Aaaa : 5 Aaaa : 1aaaa.

D 1 AAaa : 2 Aaaa : 1 aaaa.

Cu 18 c chua, gen A quy nh qutri hon ton so vi gen a quy nh quvng. Cy c chua tbiquthun chng thphn vi cy tbi quvng c F1. Cho cy F1 tthphn. F2 thu c cckiu gen:A 1 AAAA : 8 AAAa : 18 AAaa : 8Aaaa : 1 aaaa.

B 18 AAAA : 8 AAAa : 8 AAaa : 1Aaaa : 1 aaaa.

C 1 AAAA : 1 AAAa : 8 AAaa : 8Aaaa : 18 aaaa.

D 8 AAAA : 8 AAAa : 18 AAaa : 1Aaaa : 1 aaaa

Cu 19 c chua, gen A quy nh qumu tri hon ton so vi gen a quy nh qumu vng. Cy cchua tbi qu(p) tthphn sinh ra F1 c cquv quvng. Kiu gen ca p c thl

A AAAA.B AAAa.

C AAaa.

D aaaa.

Cu 20 Lai c chua quthun chng BB vi c chua quvng bb, c F1 ton qu. Xl F1 bngcnxisin ri chn mt cp giao phn th F2 thu c 11/12 scy qu+ 1/12 scy quvng. Php laicho kt quph hp lA BBbb BBbb.

B BBbb Bb.

C BBBb BBBb.D BBbb BBBb.

Cu 21 mt loi thc vt, gen A quy nh tnh trng hoa kp, gen a quy nh tnh trng hoa n. Cho laihai cy tbi vi nhau c thhlai phn li theo tl1 cy hoa kp : 1 cy hoa n. Kiu gen ca cy b,mlA AAaa AAaa.

B AAaa Aaaa.

C Aaaa aaaa.

D Aaaa Aaaa.

Cu 22 Trong trng hp khng xy ra t bin mi, cc thtbi gim phn to giao t2n c khnngthtinh. Theo l thuyt, cc php lai no sau y cho i con c cc kiu gen phn li theo tl1:2:1?

(1) AAAa AAAa. (2) Aaaa Aaaa. (3) AAaa AAAa. (4) AAaa Aaaa.

p n ng l:A (2), (3).

B (1), (4).

C (1), (2).

D (3), (4).

Cu 23 c chua, gen A quy nh tnh trng qumu tri hon ton so vi gen a quy nh tnh trng qumu vng. Cho lai nhng cy c chua tbi vi nhau, c thhlai phn li theo tl35 cy qumu :

1 cy qumu vng. Php lai cho kt quph hp lA AAaa x AAaa.

B AAAa x Aaaa.

C Aaaa x Aaaa.

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D AAAa x AAAa.

Cu 24 Cho bit gen A quy nh thn cao, gen a quy nh thn thp. Php lai no sau y khng cho tlphn li kiu hnh i sau 11 thn cao : 1 thn thp? Bit rng cc c thmang lai u gim phn bnhthng, cc giao tto ra u c khnng thtinh v hp tto ra u pht trin thnh c thlai.A AAaa x Aaaa.

B AAa x Aaa.

C AAAa x AAAa.

D AAaa x Aa

Cu 25 c chua, alen A quy nh qutri hon ton so vi alen a quy nh quvng. Bit rng cc cytbi gim phn cho giao t2n c khnng thtinh bnh thng. Tnh theo l thuyt, php lai gia hai cyc chua tbi c kiu gen AAaa v aaaa cho i con c tlkiu hnh lA 35 cy qu: 1 cy quvng.B 3 cy qu: 1 cy quvng.C 5 cy qu: 1 cy quvng.D 11 cy qu: 1 cy quvng.

Cu 26 mt loi thc vt, khi cho cy tbi c kiu gen AAaa giao phn vi cy tbi c kiu gen

Aaaa; cc cy ny gim phn u cho giao t2n. Skiu thp to ra tphp lai trn lA 36

B 16

C 6

D 12

Cu 27 mt loi thc vt, gen A qui nh ht mu nu tri hon ton so vi gen a qui nh ht mu trng;cc c them lai gim phn u cho giao t2n. Php lai khng thto ra con lai c kiu hnh ht mutrng lA AAaa x AAaa.

B AAAa x aaaa.C Aaaa x Aaaa.

D AAaa x Aaaa.

Cu 28 c chua, gen A quy nh tnh trng qumu tri hon ton so vi alen a quy nh tnh trngqumu vng. Lai nhng cy c chua tbi vi nhau (F1), thu c thhlai (F2) phn li theo tl3 cyqumu : 1 cy qumu vng. Cho bit qu trnh gim phn hnh thnh giao t2n din ra bnh thng.Kiu gen ca F1 lA AAaa x AAaa.

B AAAa x AAAa.

C Aaaa x Aaaa.

D AAAa x Aaaa.

Cu 29 mt loi thc vt, gen A quy nh tnh trng qungt, gen a quy nh tnh trng quchua. Cho lainhng cy tbi vi nhau c thhlai phn li theo tl27 cy qungt : 9 cy quchua. Kiu gen ca

bmcho kt quphp lai ph hp l

A AAaa AAaa.

B AAAa AAAa

C Aaaa Aaaa.

D AAaa Aaaa.

Cu 30 Tlkiu gen xut hin tphp lai AAaa x Aaaa lA 1AAaa : 4Aaaa : 1aaaa

B 1AAaa : 2Aaaa : 1aaaa

C 1AAAa : 5AAaa : 5Aaaa: 1aaaa

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D 1AAAA : 8AAAa : 18AAaa: 8Aaaa: 1aaaa

Cu 31 mt loi thc vt, gen B quy nh hoa tm l tri hon ton so vi gen b quy nh hoa trng. Nuqu trnh gim phn v thphn din ra bnh thng, php lai no sau y khng sinh ra cy hoa trng?A BBbb BBbb.

B Bbbb Bbbb.

C BBBb BBBb.

D BBbb Bbbb.

Cu 32 c chua c ccy tbi v cy lng bi. Gen A quy nh qumu l tri hon ton so vialen a quy nh qumu vng. Bit rng, cy tbi gim phn bnh thng v cho giao t2n, cy lng bigim phn bnh thng v cho giao tn. Cc php lai cho tlphn li kiu hnh 11 qumu : 1 qumuvng i con lA AAaa x Aa v AAaa x aaaa.

B AAaa x Aa v AAaa x AAaa.

C AAaa x aa v AAaa x Aaaa.

D AAaa x Aa v AAaa x Aaaa.

Cu 33 mt loi thc vt, gen A quy nh hoa tri hon ton so vi alen a quy nh hoa vng. Cho bit

cc cy tbi gim phn cho giao tlng bi c khnng thtinh bnh thng, khng c t bin xy ra.Theo l thuyt, php lai AAaa Aaaa cho i con c tlphn li kiu hnh l:A 1 cy hoa : 1 cy hoa vng.B 35 cy hoa : 1 cy hoa vng.C 11 cy hoa : 1 cy hoa vng.D 3 cy hoa : 1 cy hoa vng.

Cu 34 Bit rng cc thtbi gim phn cho giao tlng bi c khnng thtinh bnh thng v khngc t bin xy ra. Theo l thuyt, php lai no sau y cho i con c 5 loi kiu gen?A Aaaa Aaaa.

B AAaa AAAa.C Aaaa AAaa.

D AAaa AAaa

Cu 35 Cho mt cy c chua tbi c kiu gen AAaa lai vi mt cy lng bi c kiu gen Aa. Qu trnhgim phn cc cy bmxy ra bnh thng, cc loi giao tc to ra u c khnng thtinh. Tlkiu gen ng hp tln i con lA 1/6.

B 1/12

C 1/36.

D 1/2.

Cu 36 Dng cnsixin xl cc hp tlng bi c kiu gen Aa thu c cc thtbi. Cho cc thtbi trn giao phn vi nhau, trong trng hp cc cy bmgim phn bnh thng, tnh theo l thuyt tlphn li kiu gen i con l:

A 1AAAA : 4AAAa : 6AAaa : 4Aaaa : 1aaaa.

B 1AAAA : 8AAAa : 18AAaa : 8Aaaa : 1aaaa.

C 1AAAA : 8AAAa : 18Aaaa : 8AAaa : 1aaaa.

D 1AAAA : 8AAaa : 18AAAa : 8Aaaa : 1aaaa.

Cu 37 c chua, alen A quy nh qutri hon ton so vi alen a quy nh quvng. Bit rng cc cytbi gim phn cho giao t2n c khnng thtinh bnh thng. Tnh theo l thuyt, php lai gia hai cy

c chua tbi c kiu gen AAaa v aaaa cho i con c tlkiu hnh lA 11 cy qu: 1 cy quvng.B 3 cy qu: 1 cy quvng.C 35 cy qu: 1 cy quvng.

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D 5 cy qu: 1 cy quvng.Cu 38 Trong trng hp khng xy ra t bin mi, cc thtbi gim phn to giao t2n c khnngthtinh. Theo l thuyt, cc php lai no sau y cho i con c cc kiu gen phn li theo tl1:5:5:1?

(1) AAAa AAAa. (2) Aaaa Aaaa. (3) AAaa AAAa. (4) AAaa Aaaa.

p n ng l:A (2), (3).

B (1), (4).

C (1), (2).

D (3), (4).

Cu 39 mt loi thc vt: Gen A quy nh qutri hon ton so vi gen a quy nh quvng. Mtphp lai gia cy thun chng quvi cy quvng thu c F1, xl cxisin cc cy F1, sau cho 2cy F1 giao phi vi nhau thu c F2 c 3034 cy qu: 1001 cy quvng. Kiu gen ca cc cy F1 lA Aa x Aa.

B AAAa x Aa hoc Aa x Aaaa.C AAaa x AAaa hoc Aa x Aa.D Aaaa x Aaaa.

Cu 40 u H Lan, thn cao tri hon ton so vi thn thp. Cho giao phn gia cy thn cao vi cythn thp c F1 ton cy thn cao. Tip tc cho cy F1 tthphn thu c F2. Ly ngu nhin hai cythn cao F2 giao phn vi nhau th tlphn li kiu hnh F3 lA 15 cy thn cao : 1 cy thn thpB 3 cy thn cao : 1 cy thn thp.C 8 cy thn cao : 1 cy thn thp.D 5 cy thn cao : 3 cy thn

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Bi 3.Quy lut phn li c lp -1Cu 1 Menen tm ra qui lut phn li c lp trn c snghin cu php laiA mt hoc nhiu cp tnh trng.B mt cp tnh trng.C hai cp tnh trng.D nhiu cp trng.

Cu 2 Sau nhiu nghin cu vcc php lai hai cp tnh trng Menen nhn xt rng cc cpA gen quy nh cc tnh trng khc nhau phn li c lp trong qu trnh hnh thnh giao t.B nhn tdi truyn quy nh cc tnh trng khc nhau phn li c lp trong qu trnh hnh thnh giao t.C alen quy nh cc tnh trng khc nhau phn li c lp trong qu trnh hnh thnh giao t.D nhim sc th. quy nh cc tnh trng khc nhau phn li c lp trong qu trnh hnh thnh giao t.

Cu 3 Tkt quth nghim ca php lai hai (hoc nhiu) cp tnh trng Menen cho thy rng: Khi lai cpb, mthun chng khc nhau vhai (hoc nhiu) cp tnh trng tng phn, di truyn c lp vi nhau, thxc sut xut hin mi kiu hnh F2 bngA tng xc sut ca cc tnh trng hp thnh n.B hiu xc sut ca cc tnh trng hp thnh n.

C thng xc sut ca cc tnh trng hp thnh n.D tch xc sut ca cc tnh trng hp thnh n.

Cu 4 Khi lai u H Lan thun chng ht vng, vtrn vi ht xanh, vnhn c F1 ton ht vng, vtrn. Cho F1 tthphn, F2 thu c 4 loi kiu hnh. Loi kiu hnh thuc bin dthp lA ht vng, vnhn v ht xanh, vtrn.B ht vng, vtrn v ht xanh, vnhn.C ht vng, vtrn v ht xanh, vtrn.D ht xanh, vnhn v ht xanh, vtrn.

Cu 5 Loi giao tAbD c thc to ra tkiu gen no sau y?

A AABBDD.B AABbdd.

C AabbDd.

D aaBbDd.

Cu 6 S lai no sau y l php lai phn tch?A BBdd BBDD.

B BbDd bbdd.

C AaBb AaBb.

D Aabbdd aabbDD.

Cu 7 Trong trng hp mt gen quy nh mt tnh trng, gen tri l tri hon ton, cc gen phn li c lp,php lai AaBb x aabb cho i con c sphn li kiu hnh theo tl

A 1 : 1 : 1 : 1.

B 3 : 1.

C 1 : 1.

D 9 : 3 : 3 : 1.

Cu 8 C thc kiu gen AaBbDdEE khi gim phn cho ra sloi giao tlA 6

B

C 8

D 4

Cu 9 Loi giao tAbdE c thc to ra tkiu gen no sau y?A AABBDDEe.

B AABbddEE.

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C AabbDdee.

D aaBbDdEe.

Cu 10 Tlca loi giao tABD c to ra tkiu gen AaBbDd lA 100%.

B 50%.

C 25%.

D 12,5%.

Cu 11 Php lai AABbDd x AaBbDD sc skiu thp giao tlA 8

B 6

C 32

D 16

Cu 12 Nu P thun chng khc nhau bi n cp tnh trng tng phn di truyn phn li c lp. Tlkiugen F2 khi cho cc c thF1 giao phi hoc tthphn vi nhau lA (1 : 2 : 1)n.

B (3 : 1)n.

C (1 : 2 : 1)2.D 9 : 3 : 3 : 1.

Cu 13 Nu P thun chng khc nhau bi n cp tnh trng tng phn di truyn phn li c lp. Tlkiuhnh F2 khi cho cc c thF1 giao phi hoc tthphn vi nhau lA (1 : 2 : 1)n.

B (1 : 2 : 1)2.

C (3 : 1)n.

D (3 : 1)2.

Cu 14 Nu p thun chng khc nhau n cp tnh trng phn li c lp, sloi kiu gen c thc F2 l

A 1n.B 2n.

C 3n.

D 4n.

Cu 15 u H Lan gen A quy nh ht vng, a quy nh ht xanh; B quy nh ht trn, b quy nh htnhn, hai cp gen ny phn li c lp vi nhau. Cy mc tht vng nhn, giao phn vi cy mc thtxanh trn cho ht vng trn v xanh trn vi tl1 : 1. Kiu gen ca hai cy bmlA Aabb x aaBb.

B AAbb x aaBb.

C Aabb x aabb.

D Aabb x aaBB.

Cu 16 u H Lan gen A quy nh ht vng, a quy nh ht xanh; B quy nh ht trn, b quy nh htnhn, hai cp gen ny phn li c lp vi nhau. Php lai khng lm xut hin kiu hnh xanh nhn lA AaBb x AaBb.

B aabb x AaBB.

C Aabb x aaBb.

D AaBb x aabb.

Cu 17 u H Lan gen A quy nh ht vng tri hon ton gen a quy nh ht xanh. Gen B quy nh httrn tri hon ton gen b quy nh ht nhn. Cc gen ny phn ny phn li c lp. Php lai no sau y s

cho kiu gen v kiu hnh t nht?A AABB x AaBb.

B AABb x Aabb.

C Aabb x aaBb.

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D AABB x AABb

Cu 18 u H Lan gen A quy nh ht vng, a quy nh ht xanh; B quy nh ht trn, b quy nh htnhn, hai cp gen ny phn li c lp vi nhau. Cho cp bmc kiu gen AaBb x aaBb tlloi kiu hnhxut hin F1 lA 3 ht vng trn : 3 ht xanh trn : 1 ht vng nhn : 1 ht xanh, nhn.B 1 ht vng trn : 1 ht xanh trn : 1 ht vng nhn : 1 ht xanh, nhn.C 3 ht vng trn : 1 ht xanh trn : 3 ht vng nhn : 1 ht xanh, nhn.D 9 ht vng trn : 3 ht xanh trn : 3 ht vng nhn : 1 ht xanh, nhn.

Cu 19 mt loi thc vt, cc gen di truyn c lp c gen A quy nh cy cao, a quy nh cy thp; Bquy nh cy qu, b quy nh cy qutrng. Trong mt php lai thu c kiu hnh cy thp, qutrngchim tl1/16. Kiu gen ca cc cy bmlA AaBB x aaBb.

B Aabb x AaBB.

C AaBb x AaBb.

D AaBb x Aabb.

Cu 20 Da vo phn tch kt quth nghim, Menen cho rng tnh trng mu sc ht u v hnh dng ht

u di truyn c lp vA tlphn li kiu hnh ca mi tnh trng l 3 tri : 1 ln.B cc nhim sc thphn li c lp v thp tdo trong qu trnh thtinh.C tlmi kiu hnh F2 bng tch xc sut ca cc tnh trng hp thnh n.D sphn btlkiu hnh lun ng u hai php lai thun v nghch.

Cu 21 la, gen A quy nh tnh trng thn cao tri hon ton so vi gen a quy nh tnh trng thn thp;gen B quy nh tnh trng ht trn tri hon ton so vi gen b quy nh ht di. Cc gen quy nh tnh trngnm trn cc nhim sc thkhc nhau. Cho lai gia hai ging la thun chng thn cao, ht trn vi thnthp, ht di thu c F1. Cho F1 tthphn, F2 thu c kt quvi tlphn li kiu hnh l:

A 9: 3 : 3 : 1.B 11 :1.

C 9 : 1.

D 3 : 1.

Cu 22 u H Lan gen A quy nh ht vng tri hon ton gen a quy nh ht xanh. Gen B quy nh httrn tri hon ton gen b quy nh ht nhn. Cc gen ny phn li c lp vi nhau. Php lai no sau y choskiu hnh i sau nhiu nhtA AaBB x AaBb.

B Aabb x AaBB.

C Aabb x aaBb.

D aaBb x AaBB.

Cu 23 u H Lan gen A quy nh ht vng tri hon ton gen a quy nh ht xanh. Gen B quy nh httrn tri hon ton gen b quy nh ht nhn. Cc gen ny phn ny phn li c lp. Khi lai c thc kiugen AaBb vi c thc kiu gen Aabb scho tlkiu hnh i sau lA 9 : 3 : 3 : 1.

B 3 : 1.

C 1 : 2 : 1.

D 3 : 3 : 1 : 1.

Cu 24 Trong php lai gia 2 cy khc nhau v3 cp gen phn li c lp AABBDD x aabbdd. Tip tc cho

cc F1 tp giao. Skiu gen thu c F2 lA 32

B 64

C 27

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D 81

Cu 25 la, gen A quy nh thn cao, a quy nh thn thp; B quy nh ht trn, b quy nh ht di. Phplai cho ng lot thn cao, ht trn lA AaBB x aabb.

B AABb x aabb.

C AAbb x aaBB.

D AABb x Aabb.

Cu 26 Php lai gia 2 c thc kiu gen AaBBDd x AaBbdd vi cc gen tri l tri hon ton. Skiuhnh v kiu gen thhsau l bao nhiu?A 4 kiu hnh : 12 kiu genB 8 kiu hnh : 12 kiu genC 4 kiu hnh : 8 kiu genD 8 kiu hnh : 8 kiu gen

Cu 27 Khi cc gen phn li c lp v gen tri l tri hon ton th php lai AaBbDd aaBBDd c thtora

A 4 kiu hnh v 8 kiu gen.

B 4 kiu hnh v 12 kiu gen.C 8 kiu hnh v 8 kiu gen.D 8 kiu hnh v 16 kiu gen.

Cu 28 Theo quy lut phn li c lp, mt c thc kiu gen AaBBDdEe c thto cA 8 loi giao t.B 4 loi giao t.C 6 loi giao t.D 3 loi giao t.

Cu 29 mt loi, cp NST gii tnh l XX v XY. Mt trng bnh thng l AB CD H I XM. BNST

lng bi (2n) ca loi l:A 8B 10

C 14

D 16

Cu 30 Nu p thun chng khc nhau n cp tnh trng phn li c lp, sloi kiu gen c thc F2 lA 1n.

B 2n.

C 3n.

D 4n.

Cu 31 Theo quy lut phn li c lp ca Menen: Cc tnh trng di truyn phn li c lp vi nhau l doA tlmi kiu hnh F2 bng tch xc sut ca cc tnh trng hp thnh n.B tlphn li kiu hnh ca mi tnh trng l 3 tri : 1 ln.C cc gen quy nh cc tnh trng nm trn cc nhim sc thkhc nhau.D sphn btlkiu hnh lun ng u hai php lai thun v nghch.

Cu 32 u H Lan gen A quy nh ht vng tri hon ton gen a quy nh ht xanh. Gen B quy nh httrn tri hon ton gen b quy nh ht nhn. Cc gen ny phn ny phn li c lp. Php lai no sau y scho kiu gen v kiu hnh nhiu nht?A AaBb x AaBb.

B AABb x Aabb.C Aabb x aaBb.

D AABB x AABb

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Cu 33 u H Lan gen A quy nh ht vng tri hon ton gen a quy nh ht xanh. Gen B quy nh httrn tri hon ton gen b quy nh ht nhn. Cc gen ny phn ny phn li c lp. Php lai no sau y choskiu hnh i sau t nhtA AaBB x AaBb.

B AAbb x AaBB.

C Aabb x aaBb.

D aaBb x AaBB.

Cu 34 u H Lan gen A quy nh ht vng tri hon ton gen a quy nh ht xanh. Gen B quy nh httrn tri hon ton gen b quy nh ht nhn. Cc gen ny phn ny phn li c lp. Khi lai c thc kiugen Aabb vi c thc kiu gen Aabb scho tlkiu hnh i sau lA 9 : 3 : 3 : 1.

B 3 : 1.

C 1 : 2 : 1.

D 3 : 3 : 1 : 1.

Cu 35 Trong trng hp mi gen qui nh mt tnh trng v tnh trng tri l tri hon ton, c thc kiugen AaBbDd tthphn sthu c i con c skiu hnh v kiu gen ti a l

A 4 kiu hnh ; 9 kiu gen.B 4 kiu hnh ; 12 kiu gen.C 8 kiu hnh ; 12 kiu gen.D 8 kiu hnh ; 27 kiu gen.

Cu 36 Cho bit mi gen quy nh mt tnh trng, gen tri l tri hon ton. Theo l thuyt, php lai no sauy to ra i con c 8 loi kiu gen v 4 loi kiu hnh?A AaBbDd aabbDD.

B AaBbdd AabbDd.

C AaBbDd aabbdd.

D AaBbDd AaBbDD.Cu 37 u H Lan, gen A quy nh ht vng l tri hon ton so vi alen a quy nh ht xanh; gen B quynh ht trn l tri hon ton so vi alen b quy nh ht nhn. Hai cp gen ny phn li c lp. Cho giao

phn cy ht vng, trn vi cy ht xanh, trn. F1 thu c 120 ht vng, trn; 40 ht vng, nhn; 120 htxanh, trn; 40 ht xanh, nhn. Tlht xanh, trn c kiu gen ng hp trong tng sht xanh, trn F1 lA 1/4.

B 2/3.

C 1/3.

D 1/2.

Cu 38 Cho bit mi gen quy nh mt tnh trng, cc gen phn li c lp. Php lai no sau y cho tlphn li kiu gen i con l: 1 : 2 : 1 : 1 : 2 : 1?

A AaBb AaBb.

B Aabb aaBb.

C aaBb AaBb.

D Aabb AAbb.

Cu 39 mt loi thc vt, ngi ta tin hnh cc php lai sau:(1) AaBbDd AaBbDd. (2) AaBBDd AaBBDd. (3) AABBDd AAbbDd. (4) AaBBDd

AaBbDD.

Cc php lai c thto ra cy lai c kiu gen dhp vcba cp gen l

A (2) v (4).B (2) v (3).

C (1) v (3).

D (1) v (4).

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Cu 40 Tnh theo l thuyt, php lai no sau y cho i con c tlphn li kiu gen l 1 : 1?A AABbDd AaBBDd.

B AabbDD AABBdd.

C AaBbdd AaBBDD.

D AaBBDD aaBbDD.

Cu 41 Tlca kiu gen aaBbdd to ra tphp lai aaBbDd x AabbDd l bao nhiu?A 3,125%.

B 6,25%.

C 56,25%.

D 18,75%.

Cu 42 mt loi cn trng, gen qui nh tnh trng nm trn nhim sc ththng v di truyn theo hintng tri hon ton. Gen A: thn xm; gen a: thn en; Gen B: mt ; gen b: mt vng; Gen D: lng ngn;gen d: lng di. Cc gen ni trn phn li c lp v thp tdo trong gim phn.Php lai no sau y khng to ra kiu hnh thn en, mt vng, lng di con lai?A AaBbDd x aaBbdd.

B Aabbdd x aaBbDd.

C AaBBdd x aabbdd.D aabbDd x aabbDd.

Cu 43 mt loi cn trng, gen qui nh tnh trng nm trn nhim sc ththng v di truyn theo hintng tri hon ton. Gen A: thn xm; gen a: thn en; Gen B: mt ; gen b: mt vng; Gen D: lng ngn;gen d: lng di. Cc gen ni trn phn li c lp v thp tdo trong gim phn. Tlca loi hp tA- B-D- to ra tphp lai AaBbDd x AaBbDD l:A 6,35%

B 18,75%

C 37,5%

D 56,25%Cu 44 mt loi cn trng, gen qui nh tnh trng nm trn nhim sc ththng v di truyn theo hintng tri hon ton. Gen A: thn xm; gen a: thn en; Gen B: mt ; gen b: mt vng. Cc gen ni trn

phn li c lp v thp tdo trong gim phn. Bmc kiu gen, kiu hnh no sau y sinh ra con lai c50% thn xm, mt v 50% thn xm, mt vng?A AAbb (thn xm, mt vng) x aaBb (thn en, mt ).B AaBB (thn xm, mt ) x aabb (thn en, mt vng)C Aabb (thn xm, mt vng) x AaBB (thn xm, mt )D aaBB (thn en, mt ) x aaBb (thn en, mt )

Cu 45 mt loi cn trng, gen qui nh tnh trng nm trn nhim sc ththng v di truyn theo hin

tng tri hon ton. Gen A: thn xm; gen a: thn en; Gen B: mt ; gen b: mt vng; Gen D: lng ngn;gen d: lng di. Cc gen ni trn phn li c lp v thp tdo trong gim phn. Php lai no sau y ckhnng to ra nhiu bin dthp nht?A AaBbDD x AaBbDd.

B AABBDD x aabbdd.

C AabbDd x AabbDd.

D AaBbDd x AaBbDd

Cu 46 mt loi cn trng, gen qui nh tnh trng nm trn nhim sc ththng v di truyn theo hintng tri hon ton. Gen A: thn xm; gen a: thn en; Gen D: lng ngn; gen d: lng di. Cc gen ni trn

phn li c lp v thp tdo trong gim phn.Tlkiu hnh c to ra tphp lai AaDd x aaDd l:A 3 thn xm, lng ngn : 1 thn xm, lng di : 3 thn en, lng ngn : 1 thn en, lng diB 1 thn xm, lng di : 1 thn en, lng ngn

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C 1 thn xm, lng ngn : 1 thn xm, lng di : 1 thn en, lng ngn : 1 thn en, lng diD 3 thn en, lng di : 1 thn en, lng ngn

Cu 47 mt loi cn trng, gen qui nh tnh trng nm trn nhim sc ththng v di truyn theo hintng tri hon ton. Gen A: thn xm; gen a: thn en; Gen B: mt ; gen b: mt vng; Gen D: lng ngn;gen d: lng di. Cc gen ni trn phn li c lp v thp tdo trong gim phn. Thp ba tnh trng nitrn, skiu gen c thc loi cn trng c nu l:A 36 kiuB 27 kiuC 21 kiuD 16 kiu

Cu 48 mt loi thc vt bit rng: A-: thn cao, aa: thn thp; BB: hoa , Bb: hoa hng, bb: hoa trng.Hai tnh trng, chiu cao ca thn vo mu hoa di truyn c lp vi nhau.Php lai Aabb x aaBb cho con c tlkiu hnh no sau y?A 25% thn cao, hoa : 25% thn cao, hoa hng : 12% thn thp, hoa : 25% thn thp, hoa hngB 50% thn cao, hoa trng : 50% thn thp, hoa trngC 25% thn cao, hoa hng : 25% thn cao, hoa trng : 25% thn thp, hoa hng : 25% thn thp, hoa trng

D 75% thn cao, hoa hng : 25% thn thp, hoa trngCu 49 mt loi thc vt bit rng: A-: thn cao, aa: thn thp; BB: hoa , Bb: hoa hng, bb: hoa trngHai tnh trng, chiu cao ca thn vo mu hoa di truyn c lp vi nhau. Tlca loi kiu hnh thn thp,hoa hng to ra tphp lai AaBb x aaBb l:A 18,75%

B 25%

C 37,5%

D 56,25%

Cu 50 mt loi thc vt bit rng: A-: thn cao, aa: thn thp; BB: hoa , Bb: hoa hng, bb: hoa trng

Hai tnh trng, chiu cao ca thn vo mu hoa di truyn c lp vi nhau.Tlca loi hp tAAbb c to ra tphp lai AaBb x AaBb l:A 6,25%

B 12,5%

C 18,75%

D 25%

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Bi 4.Quy lut phn li c lp -2Cu 1 C stbo hc ca quy lut phn li c lp lA cc gen quy nh cc tnh trng nm trn cng mt cp nhim sc thtng ng. Sphn li c lp ca

hai nhim sc thdn n sphn li c lp ca cc alen.B cc gen quy nh cc tnh trng nm trn cc cp nhim sc thtng ng khc nhau. Sphn li c lp

ca cc cp gen dn n sphn li c lp ca cc cp nhim sc th.C cc gen quy nh cc tnh trng nm trn cc cp nhim sc thtng ng khc nhau. Sphn li c lp

ca cc cp nhim sc thdn n sphn li c lp ca cc cp gen.D cc gen quy nh cc tnh trng nm trn cng mt cp nhim sc thtngng. Sphn li c lp ca

cc cp nhim sc thdn n sphn li c lp ca cc cp gen.Cu 2 Mt trong nhng iu kin trong php lai hai cp tnh trng, cho F2 c tlphn li kiu hnhtun theo quy lut phn li c lp ca Menen lA cc cp gen phi nm trn cng mt cp nhim sc thtng ng.B cc gen phi nm vtr khc xa nhau trn cng mt nhim sc th.

C cc cp gen phi nm trn cc cp nhim sc thtng ng khc nhau.D cc gen phi cng tc ng hnh thnh nn nhiu tnh trng.

Cu 3 Cho ba cp gen Aa, Bb, Dd mi cp gen quy nh mt tnh trng, tri ln hon ton v cc cp genphn li c lp. Tlloi kiu hnh ca c thc kiu gen aabbdd to ra tphp lai AaBbDd x AaBbDd l

A 1/64.

B 1/16.

C 1/24.

D 1/4.

Cu 4 Trong php lai gia hai c thc kiu gen: AaBbDdEeHh aaBBDdeehh. Cc cp gen quy nh cctnh trng khc nhau nm trn cc cp NST tng ng khc nhau. Tli con c kiu hnh tri vtt c5tnh trng l

A 1/128.B 9/128.

C 3/32.

D 9/64.

Cu 5 C thP c 2 cp gen dhp (Aa, Bb) c kiu hnh ht vng, vht trn. em giao phn vi c thkhc cha bit kiu gen, thu c thhF1 c kiu hnh phn li theo tl: 3 ht vng, vht trn : 3 htxanh, vht trn : 1 ht vng, vht nhn : 1 Ht xanh, vht nhn. Kiu gen ca P lA Aabb x AaBb.

B Aabb x aaBB.

C AaBb x aaBb.

D AaBb x AaBB.

Cu 6 Mt c thc kiu gen AaBbDdEE sau 1 thi gian di tthphn lin tip qua nhiu thh, sdngthun c thc to ra l:A 2

B 4

C 10

D 8

Cu 7 Mt qun thsinh vt c gen A bt bin thnh gen a, gen B bt bin thnh gen b. Bit cc cpgen tc ng ring rv gen tri l tri hon ton. Cc kiu gen no sau y l ca tht bin?

A AABb, AaBB.

B AABB, AABb.

C aaBb, Aabb.

D AaBb, AABb.

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Cu 8 Cho cy c kiu gen AaBbDd tthphn qua nhiu thh. Nu cc cp gen ny nm trn cc cpnhim sc thkhc nhau th sdng thun ti a vcba cp gen c thc to ra lA 3

B 8

C 1

D 6

Cu 9 Trong trng hp cc gen phn li c lp, tc ng ring rv cc gen tri l tri hon ton, php lai:AaBbDdEe AaBbDdEe cho tlkiu hnh A-bbD-E- i con lA 3/256.

B 1/16.

C 81/256.

D 27/256.

Cu 10 Trong trng hp gim phn v thtinh bnh thng, mt gen quy nh mt tnh trng v gen tri ltri hon ton. Tnh theo l thuyt, php lai AaBbDdHh AaBbDdHh scho kiu hnh mang 3 tnh trngtri v 1 tnh trng ln i con chim tl

A 27/256.B 9/64.

C 27/64.

D 81/256.

Cu 11 Cho bit mt gen quy nh mt tnh trng, cc gen tri l hon ton. Khi lai hai c thc kiu genAABbDD x AaBbDd. Kt qui con scA 4 kiu hnh v 24 kiu gen.B 2 kiu hnh v 12 kiu gen.C 6 kiu hnh v 42 kiu gen.

D 8 kiu hnh v 27 kiu gen.Cu 12 ngi: D quy nh mt en, d quy nh mt xanh.Lin quan n nhm mu c:-Nhm mu A do gen IA quy nh.-Nhm mu B do gen IB quy nh.-Nhm mu O tng ng vi kiu gen IO IO .-Nhm mu AB tng ng vi kiu gen IA IB .Bit rng IA v IB l tri hon ton so vi IO, cc cp gen quy nh cc tnh trng trn nm trn cc cp

NST thng khc nhau. Vi cc cp tnh trng trn, sthp kiu gen khc nhau ngi l:A 18

B 16

C 32

D 9

Cu 13 ngi, A quy nh mt en, a: mt xanh, B: tc qun, b: tc thng. Lin quan n nhm mu c 4kiu hnh, trong nhm mu A do kiu gen IAIA v IAIO quy nh, nhm mu B do kiu gen IBIB vIBIO quy nh, nhm O tng ng vi kiu gen IOIO, nhm mu AB tng ng vi kiu gen IAIB. Cc cpgen quy nh cc tnh trng trn nm trn cc cp nhim sc ththng ng dng khc nhau. Sloi kiugen khc nhau c thc vcc tnh trng ni trn:A 32.

B 54.C 16.

D 24.

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Cu 14 cu, kiu gen HH quy nh c sng, kiu gen hh quy nh khng sng, kiu gen Hh biu hin csng cu c v khng sng cu ci. Gen ny nm trn nhim sc ththng. Cho lai cu c khngsng vi cu ci c sng c F1, cho F1 giao phi vi nhau c F2. Tnh theo l thuyt, tlkiu hnh F1 v F2 l

A F1: 1 c sng : 1 khng sng; F2: 3 c sng: 1 khng sng.B F1: 1 c sng : 1 khng sng; F2: 1 c sng: 1 khng sng.C F1: 100% c sng; F2: 1 c sng: 1 khng sng.D F1: 100% c sng; F2: 3 c sng: 1 khng sng.

Cu 15 Cho cy lng bi dhp vhai cp gen tthphn. Bit rng cc gen phn li c lp v khng ct bin xy ra. Tnh theo l thuyt, trong tng scc c ththu c i con, sc thc kiu gen nghp vmt cp gen v sc thc kiu gen ng hp vhai cp gen trn chim tlln lt lA 50% v 25%.

B 25% v 50%.

C 50% v 50%.

D 25% v 25%.

Cu 16 Cho bit mi gen quy nh mt tnh trng, cc gen phn li c lp, gen tri l tri hon ton v

khng c t bin xy ra. Tnh theo l thuyt, php lai AaBbDdEe AaBbDdEe cho i con c kiu hnhmang 2 tnh trng tri v 2 tnh trng ln chim tlA 9/256.

B 27/128.

C 9/64.

D 9/128.

Cu 17 Cho u H lan F1 lai vi nhau thu c thhsau c tlphn ly 3 vng, nhn : 1 xanh, nhn.Kiu gen ca F1 l:A aaBb.

B AaBB.C Aabb.

D AABb.

Cu 18 Cy tbi c kiu gen AAaaBBbb. Bit cc gen phn ly c lp, trnh gim phn din ra bnhthng. Tnh theo l thuyt, tlgiao tmang kiu gen Aabb c sinh ra tcy ny l:A 16/36.

B 12/36.

C 6/36.

D 4/36.

Cu 19 mt loi thc vt, alen A quy nh qutri hon ton so vi alen a quy nh quvng; alen B

quy nh qungt tri hon ton so vi alen b quy nh quchua. Bit rng khng pht sinh t bin mi vcc cy tbi gim phn bnh thng cho cc giao t2n c khnng thtinh. Cho cy tbi c kiu genAAaaBbbb tthphn. Theo l thuyt, tlphn li kiu hnh i con lA 105:35:3:1.

B 105:35:9:1.

C 35:35:1:1.

D 33:11:1:1.

Cu 20 Ngi ta tin hnh lai gia hai cy thuc l c kiu gen (P): aaBB Aabb. Bit rng 2 alen A v anm trn cp NST s3, 2 alen B v b nm trn cp NST s5. Kiu gen ca con lai trong trng hp con lai

c ta bi ha ln thnh 4n lA AaaaBbbb.

B AAaaBBbb.

C AAAaBBBb.

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D AAaaBBBb.

Cu 21 Mt nhm tbo sinh tinh chmang t bin cu trc hai nhim sc ththuc hai cp tng ngs3 v s5. Bit qu trnh gim phn din ra bnh thng v khng xy ra trao i cho. Tnh theo l thuyt,tlloi giao tkhng mang nhim sc tht bin trong tng sgiao tlA 1/2.

B 1/4.

C 1/8.

D 1/16.

Cu 22 Trong mt tbo sinh tinh, xt hai cp nhim sc thc k hiu l Aa v Bb. Khi tbo ny gimphn, cp Aa phn li bnh thng, cp Bb khng phn li trong gim phn I, gim phn II din ra bnhthng. Cc loi giao tc thc to ra tqu trnh gim phn ca tbo trn lA ABb v A hoc aBb v a.B ABB v abb hoc AAB v aab.C ABb v a hoc aBb v A.D Abb v B hoc ABB v b.

Cu 23 C 3 tbo sinh tinh ca mt c thc kiu gen AaBbddEe tin hnh gim phn bnh thng hnh

thnh tinh trng. Sloi tinh trng ti a c thto ra lA 8

B 6

C 4

D 2

Cu 24 Chu chu ci c cp nhim sc thgii tnh XX (2n = 24), chu chu c XO (2n = 23). Nu tt ccc cp gen trn cc cp NST u tn ti trng thi dhp, khi chu chu c gim phn bnh thng scho sloi giao tl:A 212 loi.

B 211 loi.C 211 +1 loi.D 223 loi.

Cu 25 Trong trng hp cc gen phn li c lp, tc ng ring rv cc gen tri l tri hon ton, phplai: AaBbDdEE AaBbDdee cho tlkiu hnh A-bbD-E- i con lA 3/256.

B 9/64.

C 81/256.

D 27/256.

Cu 26 mt loi thc vt, alen A quy nh thn cao tri hon ton so vi alen a quy nh thn thp; alen B

quy nh hoa tri hon ton so vi alen b quy nh hoa vng. Bit khng c t bin xy ra, tnh theo lthuyt, php lai AaBb Aabb cho i con c kiu hnh thn cao, hoa chim tlA 37,50%.

B 56,25%.

C 6,25%.

D 18,75%.

Cu 27 u H Lan, alen A quy nh thn cao tri hon ton so vi alen a quy nh thn thp; alen B quynh hoa tri hon ton so vi alen b quy nh hoa trng; cc gen phn li c lp. Cho hai cy u (P)giao phn vi nhau thu c F1 gm 37,5% cy thn cao, hoa ; 37,5% cy thn thp, hoa ; 12,5% cy

thn cao, hoa trng v 12,5% cy thn thp, hoa trng. Bit rng khng xy ra t bin, theo l thuyt, tlphn li kiu gen F1 l:

A 3:1:1:1:1:1.

B 3:3:1:1.

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C 2:2:1:1:1:1.

D 1:1:1:1:1:1:1:1.

Cu 28 Cho bit qu trnh gim phn v thtinh din ra bnh thng. Theo l thuyt, php lai: AaBbDd AaBbDd cho i con c kiu gen dhp vc3 cp gen chim tlA 12,5%.

B 50%.

C 25%.

D 6,25%.

Cu 29 ngi, kiu gen IAIA, IAIO quy nh nhm mu A; kiu gen IBIB, IBIO quy nh nhm mu B;kiu gen IAIB quy nh nhm mu AB; kiu gen IOIO quy nh nhm mu O. Ti mt nh hsinh, ngi tanhm ln 2 a trs sinh vi nhau. Trng hp no sau y khng cn bit nhm mu ca ngi cha mvn c thxc nh c a trno l con ca ngi mno?A Hai ngi mc nhm mu A v nhm mu B, hai a trc nhm mu B v nhm mu AB Hai ngi mc nhm mu AB v nhm mu O, hai a trc nhm mu O v nhm mu AB.C Hai ngi mc nhm mu A v nhm mu O, hai a trc nhm mu O v nhm mu A.D Hai ngi mc nhm mu B v nhm mu O, hai a trc nhm mu B v nhm mu O.

Cu 30 Cho cy c kiu gen AaBbDd tthphn qua nhiu thh. Nu cc cp gen ny nm trn cc cpnhim sc thkhc nhau th tlsc thmang mt cp gen dhp c to ra lA 1/64.

B 1/8.

C 3/8.

D 3/64.

Cu 31 Cho bit mt gen quy nh mt tnh trng, gen tri l tri hon ton, cc gen phn li c lp. C thdhp v2 cp gen tthphn, F1 thu c tng s240 ht. Tnh theo l thuyt, sht dhp tv2 cpgen F1 l

A 30B 50

C 60

D 76

Cu 32 Cho cy lng bi dhp vba cp gen tthphn. Bit rng cc gen phn li c lp v khng ct bin xy ra. Tnh theo l thuyt, trong tng scc c ththu c i con, sc thc kiu gen nghp vmt cp gen v sc thc kiu gen ng hp vhai cp gen trn chim tlln lt lA 25% v 50%.

B 46,875% v 15,625%.

C 12,5% v 12,5%.

D 37,5% v 37,5%.

Cu 33 mt loi thc vt lng bi, alen A quy nh thn cao tri hon ton so vi alen a quy nh thnthp; alen B quy nh hoa tri hon ton so vi alen b quy nh hoa vng, cc gen phn li c lp. Chocy thn cao, hoa (P) tthphn, thu c F1 gm 4 loi kiu hnh. Cho cy P giao phn vi hai cykhc nhau:

- Vi cy thnht, thu c i con c kiu hnh phn li theo tl1:1:1:1.- Vi cy thhai, thu c i con chc mt loi kiu hnh.Bit rng khng xy ra t bin v cc c thcon c sc sng nh nhau. Kiu gen ca cy P, cy thnht vcy thhai ln lt l:

A AaBb, Aabb, AABB.B AaBb, aaBb, AABb.

C AaBb, aabb, AABB.

D AaBb, aabb, AaBB.

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Cu 34 em lai cp bmu dhp v3 cp gen AaBbDd. Bit mt gen quy nh mt tnh trng. xc sutthu i con mang 2 tnh trng tri v 1 tnh trng ln l:A 15/64.

B 1/32.

C 27/64.

D 1/64.

Cu 35 Cc tbo sinh tinh ca c thc kiu gen AaBbDd tin hnh gim phn bnh thng. Bit rngkhng xy ra t bin, theo l thuyt, sloi tinh trng ti a c thc to ra lA 2

B 4

C 8

D 6

Cu 36 Mt tbo sinh tinh AaBbDd gim phn bnh thng thc tcho my tinh trngA 8

B 2

C 4

D 1Cu 37 C 1 tbo sinh tinh ca mt c thc kiu gen AaBbddEe tin hnh gim phn bnh thng hnhthnh tinh trng. Loi tinh trng mang gen AbdE c thto ra vi xc sutA 1/2.

B 1/8.

C 1/6.

D 1/4.

Cu 38 Cho bit mi gen quy nh mt tnh trng, alen tri l tri hon ton v khng xy ra t bin. Theol thuyt, cc php lai no sau y cho i con c tlphn li kiu gen khc vi tlphn li kiu hnh?

A Aabb AaBb v AaBb AaBb.B Aabb aabb v Aa aa.

C Aabb aaBb v AaBb aabb.

D Aabb aaBb v Aa aa.

Cu 39 Bin dthpA khng phi l nguyn liu ca tin ho.B khng lm xut hin kiu hnh mi.C pht sinh do sthp li vt cht di truyn ca bv m.D chxut hin trong qun thtphi.

Cu 40 Quy lut phn li c lp thc cht ni vA sphn li c lp ca cc tnh trng.B sphn li kiu hnh theo tl9 : 3 : 3 : 1.C sthp tdo ca cc alen trong qu trnh thtinh.D sphn li c lp ca cc alen trong qu trnh gim phn.

Cu 41 mt loi thc vt bit rng: A-: thn cao, aa: thn thp; BB: hoa , Bb: hoa hng, bb: hoa trngHai tnh trng, chiu cao ca thn vo mu hoa di truyn c lp vi nhau. Con lai c tlkiu hnh 75%thn cao, hoa hng : 25% thn thp, hoa hng c to ra tphp lai no sau y?A AaBb x AaBb

B AABb x aaBb

C AaBB x AabbD AABB x aabb

Cu 42 Tlkiu gen caphp lai AaBbDd x AaBbDd c trin khai tbiu thc no sau y?A (1 : 2 : 1) (1 : 2 : 1) (1 : 2 : 1)

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B (1 : 2 : 1) (3 : 1)

C (3 : 1) (3 : 1) (3 : 1)

D (1 : 2 : 1) (3 : 1) (1 : 1)

Cu 43 Khi ni vkiu gen AaBBDd. Pht biu c ni dung khng ng l:A Kiu gen AaBBDd l thdhp.B Kiu gen AaBBDd to ra 4 loi giao tvi tlngang nhau.C Kiu gen AaBBDd lai phn tch cho 4 kiu hnh vi tlngang nhau (nu mi gen qui nh mt tnh

trng).D Kiu gen AaBBDd to giao taBD c tl12,5%.

Cu 44 F1 dhp hai cp gen lai vi nhau. Bit mi gen qui nh mt tnh trng, tri ln hon ton mi gennm trn mt nhim sc th. Kt qui F2 thu c cA 6 kiu hnh khc nhau.B tlkiu hnh l 3 : 3 : 1 : 1.C 14 thp.D 9 kiu gen.

Cu 45 mt loi bcnh cng: gen A qui nh mt dt l tri so vi gen a qui nh mt li. Gen B qui

nh mt xm l tri so vi gen b qui nh mt trng. Bit gen nm trn nhim sc ththng v thmt dtng hp bcht ngay sau khi sinh. Trong php lai AaBb x AaBb, ngi ta thu c 780 c thcon sngst. Sc thcon c mt li, mu trng lA 130

B 65

C 49

D 195

Cu 46 Lai hai cy c tm c kiu gen AaBB v Aabb vi nhau. Bit rng, cp gen A, a nm trn cp nhimsc ths2, cp gen B, b nm trn cp nhim sc ths6. Do xy ra t bin trong gim phn nn to ra

cy lai l thba cp nhim sc ths2. Cc kiu gen no sau y c thl kiu gen ca thba c to ratphp lai trn?A AAaBb v AaaBb.

B Aaabb v AaaBB.

C AaaBb v AAAbb.

D AAaBb v AAAbb.

Cu 47 Trong qu trnh gim phn ca c thc c kiu gen AaBb, mt stbo, cp nhim sc thmang cp gen Aa khng phn li trong gim phn I, cp nhim sc thmang cp gen Bb phn li bnh thng;gim phn II din ra bnh thng. c thci c kiu gen AABb, qu trnh gim phn din ra bnh thng.Theo l thuyt, php lai: AABb AaBb cho i con c ti a bao nhiu loi kiu gen?A 12.

B 8.

C 4.

D 6.

Cu 48 mt loi sinh vt, xt mt tbo sinh tinh c hai cp nhim sc thk hiu l Aa v Bb. Khi tbo ny gim phn hnh thnh giao t, gim phn I cp Aa phn li bnh thng, cp Bb khng phn li;gim phn II din ra bnh thng. Sloi giao tc thto ra ttbo sinh tinh trn lA 4

B 6

C 2D 8

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Cu 49 Mt nhm tbo sinh tinh chmang t bin cu trc ba nhim sc ththuc ba cp tng ngs1, s3 v s5. Bit qu trnh gim phn din ra bnh thng v khng xy ra trao i cho. Tnh theo lthuyt, tlloi giao tmang nhim sc tht bin trong tng sgiao tlA 1/4

B 1/2

C 3/4

D 7/8

Cu 50 Trong mt tbo sinh tinh, xt hai cp nhim sc thc k hiu l Aa v Bb. Khi tbo ny gimphn, cp Aa khng phn li trong gim phn I, gim phn II din ra bnh thng. Cp Bb phn li bnhthng. Cc loi giao tc thc to ra tqu trnh gim phn ca tbo trn lA Abb v B hoc ABB v b.B ABb v A hoc aBb v a.C AAB v b hoc AAb v B.D AaB v b hoc Aab v B.

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Bi 5.Luyn tp tng hp quy lut phn li v Quy lut phn li c lpCu 1 mt loi thc vt A qui nh hoa l tri hon ton so vi a qui nh hoa trng. Lai 2 cy bmu hoa vi nhau thu c F1 ton hoa . Cho F1 tp giao F2 xut hin choa v hoa trng. Kiugen ca hai cy bmlA AA x AA.

B AA x Aa.

C Aa x Aa

D AA x aa.

Cu 2 Theo kt quth nghim ca Menen, khi lai 2 c thbmkhc nhau v1 cp tnh trng tngphn, thun chng th thhth2 c sphn tnh vkiu gen theo tl

A 0,25AA : 0,50Aa: 0,25aa.

B 0,50AA : 0,50aa.

C 0,75AA : 0,25aa.

D 100% Aa.

Cu 3 Xt 2 tnh trng khc nhau mt loi thc vt, trong mi gen - 1 tnh trng, c 1 tnh trng l trikhng hon ton v cc gen phn li c lp, thp tdo. Php lai AaBb x AaBb cho tlphn li kiu hnh

i lai lA 9:3:3:1

B 1:1:1:1

C 3:3:1:1

D 3:6:3:1:2:1

Cu 4 u h lan : A qui nh ht vng, a- ht xanh. B- ht trn, a- ht nhn. Cc gen nm trn cc nhimsc thkhc nhau. Lai cp bmthun chng, bc kiu hnh ht vng trn, mc kiu hnh ht xanh, vnhn, F1 thu c ton kiu hnh ht vng, vtrn. Cho F1 lai phn tch, Fa kiu gen Aabb chim tlA 12,5%.

B 6,25%C 50%

D 25%

Cu 5 Tlkiu gen i con ca php lai AaBbDd x AabbDd c trin khai tbiu thc no sau y:A (1 : 2 : 1) (1 : 1) (1 : 2 : 1).

B (1 : 2 : 1) (1 :2 : 1)( 1 : 2 : 1).

C (3 : 1) (3 : 1) (3 : 1).

D (1 : 2 : 1) (3 : 1) (1 : 1)

Cu 6 Tlkiu hnh i con ca php lai AaBbDd x AaBbdd c trin khai tbiu thc no sau y.Bit mt gen quy nh mt tnh trng, tri ln hon ton.A (1 : 2 : 1) (1 : 2 : 1) (1 : 1).

B (1 : 2 : 1) (3 : 1).

C (3 : 1) (3 : 1) (1 : 1).

D (1 : 2 : 1) (3 : 1) (1 : 1).

Cu 7 Cho c thc kiu gen AaBbDd tthphn, vi mi gen quy nh mt tnh trng, tnh trng tri ltri hon ton. Tlkiu hnh tri c3 tnh trng i lai l:A 1/64

B 9/64

C 27/64

D 18/64

Cu 8 Trong trng hp, mi gen quy nh mt tnh trng, tnh trng tri l tri hon ton, cc gen phn lic lp. Php lai cho nhiu bin dthp nht lA AaBbDd x AabbDd

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B AaBbDd x AaBbDd

C AABBDd x AaBBDD

D AaBbDd x aabbDd

Cu 9 Cc gen phn li c lp v tri hon ton, php lai: AaBbDdEe x AaBbDdEe cho thhsau vi kiuhnh gm 3 tnh trng tri v 1 tnh trng ln vi tl:A 27/128.

B 27/64.

C 27/256.

D 81/256.

Cu 10 Php lai : AaBbDdEe x AaBbDdEe. Tnh xc sut F1 c Kiu gen c 6 alen triA 7/64

B 9/64

C 12/64

D 15/64

Cu 11 du tm A qui nh thn cao l tri hon ton so vi a qui nh thn thp. Lai cy tbi c kiugen AAaa vi cy Aaaa. Bit chcc giao tlng bi mi c khnng thtinh. Tlkiu hnh i sau l

A 11 cy cao : 1 cy thp.B 3 cy cao : 1 cy thp.C 35 cy cao : 1 cy thp.D 15 cy cao : 1 cy thp.

Cu 12 Cho cc c thtbi c kiu gen AAaa tthphn. Tnh theo l thuyt th tli con c kiu genAaaa l bao nhiu? Bit chcc giao tlng bi mi c khnng sng:A 18/36

B 1/36

C 4/36

D 8/36Cu 13 Cc gen phn li c lp, tc ng ring rv mi gen qui nh mt tnh trng.Php lai AaBbDd x AAbbDd cho i sau c tlcy cy dhp lA 3/4

B 1/8.

C 7/8

D 27/32

Cu 14 Cc gen phn li c lp, tc ng ring rv mi gen qui nh mt tnh trng.Php lai AaBbDd x AAbbDd cho i sau c skiu gen v kiu hnh ln lt lA 8 kiu gen v 8 kiu hnhB 8 kiu gen v 4 kiu hnhC 12 kiu gen v 8 kiu hnhD 12 kiu gen v 4 kiu hnh

Cu 15 chui : A qui nh thn cao l tri hon ton so vi a qui nh thn thp. Kt qusphn li kiugen ca php lai gia 2 cy tbi AAaa vi Aaaa l( bit chcc giao tlng bi mi c khnng sng)A 1/12AAAa : 5/12AAaa : 5/12Aaaa : 1/12aaaa.

B 1/6 AAAa : 4/6 AAaa : 1/6 aaaa.

C 1/6 AAAa : 2/6AAaa 2/6 Aaaa : 1/6aaaa.

D 3/6AAAa : 3/6aaaa.

Cu 16 Vi php lai gia cc kiu gen AabbDd v AaBbDd xc sut thu c kiu hnh A-B-D- lA 12,5%

B 37,5%

C 28,125%

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D 56,25%

Cu 17 Mt ngi n ng mang nhm mu A v mt phnmang nhm mu B c thc cc con vinhng kiu hnh no?A chc A hoc BB AB hoc OC A, B, AB hoc OD A, B hoc O

Cu 18 em lai hai c thu dhp v3 cp gen AaBbDd, xc sut thu c kiu gen ng hp i conl:

A 1/64.

B 1/16.

C 2/64.

D 1/8.

Cu 19 Trong php lai gia hai c thc kiu gen sau y: AaBbDdEeHh x aaBbDdeehhTli con c kiu gen dhp tc5 gen l:A 1/32

B 9/ 128C 1/128

D 9/32

Cu 20 mt loi lng bi xt 2 gen: Gen thI c 3 alen, gen thII c 4 alen, hai gen nm trn hai cpNST thng khc nhau. Qun thngu phi c bao nhiu kiu gen dhp vc2 gen trn?

A 12

B 15

C 18

D 24

Cu 21 Giskhng c t bin xy ra, mi gen quy nh mt tnh trng v gen tri l tri hon ton. Tnhtheo l thuyt, php lai AabbDdEe aaBbddEE cho i con c kiu hnh tri vc4 tnh trng chim tlA 12,50%.

B 6,25%.

C 18,75%.

D 37,50%.

Cu 22 Tnh theo l thuyt, php lai no sau y cho i con c tlphn li kiu gen l 1 : 1?A AABbDd AaBBDd.

B AabbDD AABBdd.

C AaBbdd AaBBDD

D AaBBDD aaBbDD

Cu 23 mt loi thc vt, alen A quy nh thn cao tri hon ton so vi alen a quy nh thn thp; alen Bquy nh hoa tri hon ton so vi alen b quy nh hoa vng. Bit khng c t bin xy ra, tnh theo lthuyt, php lai AaBb Aabb cho i con c kiu hnh thn cao, hoa chim tlA 37,50%.

B 56,25%.

C 6,25%.

D 18,75%.

Cu 24 u H Lan, alen A quy nh thn cao tri hon ton so vi alen a quy nh thn thp; alen B quy

nh hoa tri hon ton so vi alen b quy nh hoa trng; cc gen phn li c lp. Cho hai cy u (P)giao phn vi nhau thu c F1 gm 37,5% cy thn cao, hoa ; 37,5% cy thn thp, hoa ; 12,5% cythn cao, hoa trng v 12,5% cy thn thp, hoa trng. Bit rng khng xy ra t bin, theo l thuyt, trongtng scy cao, hoa to ra F1, cy c kiu gen ng hp chim tl:

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A 1/8.

B 3/8.

C 1/3.

D 2/3.

Cu 25 Cho bit mi gen quy nh mt tnh trng, alen tri l tri hon ton v khng xy ra t bin. Theol thuyt, cc php lai no sau y cho i con c tlphn li kiu gen khc vi tlphn li kiu hnh?A Aabb Aabb v aaBb aaBb.

B Aabb aabb v Aa aa.

C Aabb aaBb v AaBb aabb.

D Aabb aaBb v Aa aa.

Cu 26 mt loi thc vt lng bi, alen A quy nh thn cao tri hon ton so vi alen a quy nh thnthp; alen B quy nh hoa tri hon ton so vi alen b quy nh hoa vng, cc gen phn li c lp. Chocy thn cao, hoa (P) tthphn, thu c F1 cho tlphn li kiu hnh l 9:3:3:1. Cho cy P giao phnvi hai cy khc nhau:- Vi cy thnht, thu c i con c kiu hnh phn li theo tl3:3:1:1.- Vi cy thhai, thu c i con chc mt loi kiu hnh.

Bit rng khng xy ra t bin v cc c thcon c sc sng nh nhau. Kiu gen ca cy P, cy thnht vcy thhai ln lt l:A AaBb, Aabb, AABB

B AaBb, aaBb, AABb.

C AaBb, aabb, AABB.

D AaBb, aabb, AaBB.

Cu 27 Salen ca gen I, II v III ln lt l 3, 4 v 5. Bit cc gen u nm trn NST thng v khngcng nhm lin kt. Skiu gen ng hp vtt ccc gen v dhp tt ccc gen ln lt l:A 60 v 90.

B 120 v 180.C 60 v 180.

D 30 v 60.

Cu 28 Khi lai u H Lan thun chng ht vng, vtrn vi ht xanh, vnhn c F1 ton ht vng, vtrn. Cho F1 tthphn, F2 thu c 4 loi kiu hnh. Loi kiu hnh thuc bin dthp lA ht vng, vnhn v ht xanh, vtrn.B ht vng, vtrn v ht xanh, vnhn.C ht vng, vtrn v ht xanh, vtrn.D ht xanh vnhn v ht ht xanh, vtrn.

Cu 29 Bit 1 gen quy nh mt tnh trng, cc cp gen nm trn cc cp NST khc nhau, tnh tri l trihon ton. Nu thhP c kiu gen AABBDD x aabbdd th thhlai th2 sxut hin bao nhiu kiu bindthp?A 6

B 8

C 2

D 4

Cu 30 Cho bit mi tnh trng do mt cp gen quy nh v phn li c lp vi nhau.i con ca php laiAaBbDdEe x AaBbDdEe, kiu hnh c ba tnh trng ln v 1 tnh trng tri chim tl:A 9/16

B 27/128C 27/64

D 3/64

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Cu 31 Nu cho cy c kiu gen AaBb tthphn th xc sut thu c t nht 1 cy c kiu hnh tri camt hoc hai gen l bao nhiu:A 63,5%

B 75,25%

C 93,75%

D 83,75%

Cu 32 Gismi gen quy nh mt tnh trng, phn ly c lp, thp tdo th thhcon ca php lai:AaBbDdEeHh x AaBbDdEeHh tlcon c kiu hnh tri v4 tnh trng l:A 405/1024

B 27/256

C 18/256

D 81/1024

Cu 33 Giskhng c t bin xy ra, mi gen quy nh mt tnh trng v gen tri l tri hon ton. Tnhtheo l thuyt, php lai AabbDdEe aaBbDdEE cho i con c kiu hnh tri vc4 tnh trng chim tlA 12,50%.

B 6,25%.

C 18,75%.D 37,50%.

Cu 34 Trong php lai gia hai c thc kiu gen: AaBbDdEeHh aaBbDdeehh. Cc cp gen quy nh cctnh trng khc nhau nm trn cc cp NST tng ng khc nhau. Tli con c kiu gen ng hp v4cp v dhp v1 cp lA 5/32.

B 5/128.

C 1/64.

D 9/64.

Cu 35 Cho bit mi gen quy nh mt tnh trng, cc gen phn li c lp, gen tri l tri hon ton vkhng c t bin xy ra. Tnh theo l thuyt, php lai AaBbDdEe AabbDdEe cho i con c kiu hnhmang 3 tnh trng tri v 1 tnh trng ln chim tlA 27/128.

B 13/64.

C 27/64.

D 9/128.

Cu 36 Cho php lai P: AaBbddEe x AaBBddEe (cc gen tri l tri hon ton). Tlloi kiu hnh mang 2tnh tri v 2 tnh ln F1 lA 9/128.

B 1/2.

C 3/16.

D 6/16.

Cu 37 Cho bit mi gen quy nh mt tnh trng, cc gen phn li c lp, gen tri l tri hon ton vkhng c t bin xy ra. Tnh theo l thuyt, php lai AaBbDdEe AaBbDdEe cho i con c kiu genng hp v2 cp gen v dhp v2 cp gen chim tlA 27/64.

B 7/128.

C 3/8.

D 27/256.Cu 38 mt loi thc vt, alen A quy nh qutri hon ton so vi alen a quy nh quvng; alen Bquy nh qungt tri hon ton so vi alen b quy nh quchua. Bit rng khng pht sinh t bin mi v

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cc cy tbi gim phn bnh thng cho cc giao t2n c khnng thtinh. Cho lai 2 cy tbi c kiugen AAaaBbbb x AaaaBbbb. Theo l thuyt, tlphn li kiu hnh i con lA 15:5:3:1.

B 5:5:1:1.

C 35:35:1:1.

D 33:11:3:1.

Cu 39 Trong mt qun ththc vt lng bi, lcut 1 c 5 alen, lcut 2 c 4 alen, lcut 3 c 3 alen phn lic lp nm trn NST thng. Qu trnh ngu phi sto ra trong qun thti a bao nhiu loi kiu gen vcc alen trn?

A 60.

B 900.

C 90.

D 600.

Cu 40 ngi bNST 2n = 46. Trong trng hp khng xy ra trao i cho. Tlcon sinh ra tmtcp bmbt k c cha 23 NST ca b ni lA 1/246.

B 246.C 223.

D 1/223.

Cu 41 Tbo ban u c 3 cp nhim sc thtng ng k hiu l AaBbDd tham gia nguyn phn. Gismt NST ca cp Aa v mt NST ca cp Bb khng phn li. C thgp cc tbo con c thnh phnnhim sc thlA AAaaBBDd v AaBBbDd hoc AAabDd v aBBbDd.B AaBbDd v AAaBbbdd hoc AAaBBbDd v abDd.C AaBBbDd v abDd hoc AAabDd v AaBbbDd.

D AAaBBbDd v abDd hoc AAabDd v aBBbDd.Cu 42 Theo Menen quy lut phn li c lp c pht biu nh sau:A Cc cp gen quy nh cc cp tnh trng khc nhau phn li c lp, thp tdo trong gim phn v th

tinh.

B Cp nhn tdi truyn quy nh cc tnh trng khc nhau phn li cng nhau trong qu trnh hnh thnhgiao t.C Cc cp nhn tdi truyn quy nh cc tnh trng khc nhau phn li c lp trong qu trnh hnh thnh

giao t.D Cc cp gen quy nh cc cp tnh trng khc nhau phn li cng nhau trong qu trnh hnh thnh giao t.

Cu 43 ngha khng phi c rt ra tcc luy lut ca Menen lA nu bit c cc gen quy nh cc tnh trng no phn li c lp th c thdon c kt qu

phn li kiu hnh i sau.B khi cc cp alen phn li c lp th qu trnh sinh sn hu tnh sto ra mt slng rt ln cc bin d

thp.C cc gen cng nm trn mt nhim sc thphn li v thp cng nhau trong qu trnh phn bo lm

thnh mt nhm gen lin kt.D cc nhim sc thphn li c lp sto ra nhiu loi giao t, khi thtinh sto ra nhiu kiu thp gen

khc nhau.

Cu 44 Salen ca gen I, II v III ln lt l 3, 4 v 5. Bit cc gen u nm trn NST thng v khng

cng nhm lin kt. Skiu gen dhp l:A 840.

B 690.

C 750.

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D 660.

Cu 45 Giskhng c t bin xy ra, mi gen quy nh mt tnh trng v gen tri l tri hon ton. Tnhtheo l thuyt, php lai AabbDdEe aaBbddEE cho i con c kiu hnh tri v3 tnh trng v ln v1 tnhtrng chim tlA 12,50%.

B 6,25%.

C 18,75%.

D 37,50%.

Cu 46 Tnh theo l thuyt, php lai no sau y cho i con c tlphn li kiu gen l 1 : 1?A AABbDd AaBBDd.

B AabbDD AABBdd.

C AaBbdd AaBBDD

D AaBBDD aaBbDD

Cu 47 mt loi thc vt, alen A quy nh thn cao tri hon ton so vi alen a quy nh thn thp; alen Bquy nh hoa tri hon ton so vi alen b quy nh hoa vng. Bit khng c t bin xy ra, tnh theo lthuyt, php lai AaBb Aabb cho i con c kiu hnh thn thp, hoa chim tl

A 37,50%.B 12,5%.

C 6,25%.

D 18,75%.

Cu 48 Menen rt ra kt lun: Sdi truyn ca cc cp tnh trng khng phthuc vo nhau khi ngnhn thy:A Stng tc gia cc alen trong vic qui nh kiu hnh.B Githuyt giao tthun khitC Hin tng phn ly ca cc cp NST trong nguyn phn.

D Tlphn li kiu hnh chung bng tch xc sut tlphn ly ca cc tnh trng hp thnh.Cu 49 Cho cp P thun chng vcc gen tng phn giao phn vi nhau. Tip tc tthphn cc cy F1vi nhau, thu c F2 c 75 cy mang kiu gen aabbdd. Vl thuyt, hy cho bit scy mang kiu genAaBbDd F2 l bao nhiu?A 150 cy.

B 300 cy.

C 450 cy.

D 600 cy.

Cu 50 Nu P thun chng vhai cp gen tng phn phn li c lp th tlca cc thng hp thu cF2 lA 12,5%.

B 18,75%.

C 25%.

D 37,5%.

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Bi 6.Tng tc gen bsung (btr) -1

Cu 1 mt loi mu sc hoa do hai cp gen (Aa v Bb) khng cng lcut tng tc bsung hnh thnhnn. Trong , nu c chai gen tri A v B hoa sbiu hin mu , nu chc 1 trong 2 alen tri hockhng c alen tri no th cy hoa c mu trng. Tnh trng mu sc hoa u thm di truyn theo quy lut

A tng tc cng gp.

B phn li c lp.

C tng tc bsung.

D phn li.

Cu 2 mt loi mu sc hoa do hai cp gen (Aa v Bb) khng cng lcut tng tc bsung hnh thnhnn. Trong , nu c chai gen tri A v B hoa sbiu hin mu , nu chc 1 trong 2 alen tri hockhng c alen tri no th cy hoa c mu trng. Khi cho hai cy hoa v hoa trng lai vi nhau c thhF1 phn li theo tl: 1/4 hoa : 3/4 hoa trng. Kiu gen ca hai c thbmem lai l

A AABb x aaBb.

B AaBb x aabb.

C AaBb x Aabb.

D AaBb x Aabb.

Cu 3 mt loi mu sc hoa do hai cp gen (Aa v Bb) khng cng lcut tng tc bsung hnh thnhnn. Trong , nu c chai gen tri A v B hoa sbiu hin mu , nu chc 1 trong 2 alen tri hoc

khng c alen tri no th cy hoa c mu trng. Khi cho hai cy hoa v hoa trng lai vi nhau c thhF1 phn li theo tl: 1/2 hoa : 1/2 hoa trng. Kiu gen ca hai c thbmem lai l

A AaBB x aaBB.

B AaBb x Aabb.

C AABb x aaBb.

D AaBb x AaBB.

Cu 4 mt loi mu sc hoa do hai cp gen (Aa v Bb) khng cng lcut tng tc bsung hnh thnhnn. Trong , nu c chai gen tri A v B hoa sbiu hin mu , nu chc 1 trong 2 alen tri hockhng c alen tri no th cy hoa c mu trng. Cho cp bmc kiu gen AaBb x Aabb tlkiu hnhxut hin F1 l

A 1/4 hoa : 3/4 hoa trng.

B 5/8 hoa : 3/8 hoa trng.

C 3/4 hoa : 1/4 hoa trng.

D 3/8 hoa : 5/8 hoa trng.

Cu 5 mt loi mu sc hoa do hai cp gen (Aa v Bb) khng cng lcut tng tc bsung hnh thnhnn. Trong , nu c chai gen tri A v B hoa sbiu hin mu , nu chc 1 trong 2 alen tri hoc

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khng c alen tri no th cy hoa c mu trng. Khi lai hai gng u hoa trng thun chng c F1 tonu hoa . Kiu gen ca cc cy u thhP l

A AABB x aaBB.

B AAbb x aaBB.

C AABB x aabb.

D AAbb x Aabb

Cu 6 mt loi mu sc hoa do hai cp gen (Aa v Bb) khng cng lcut tng tc bsung hnh thnhnn. Trong , nu c chai gen tri A v B hoa sbiu hin mu , nu chc 1 trong 2 alen tri hockhng c alen tri no th cy hoa c mu trng. Cho F1 Hoa c to ra t2 ging hoa trng thunchng em lai phn tch thhFa sl:

A Ton hoa .

B 1 : 1 trng.

C 3 : 1 trng.

D 3 trng : 1 .

Cu 7 mt loi mu sc hoa do hai cp gen (Aa v Bb) khng cng lcut tng tc bsung hnh thnhnn. Trong , nu c chai gen tri A v B hoa sbiu hin mu , nu chc 1 trong 2 alen tri hockhng c alen tri no th cy hoa c mu trng. Cho F1 Hoa c to ra t2 ging hoa trng thunchng tthphn thhF2 sl:

A 15 : 1.

B 3 : 1

C 9 : 7.

D 5 : 3.

Cu 8 mt loi mu sc hoa do hai cp gen (Aa v Bb) khng cng lcut tng tc bsung hnh thnhnn. Trong , nu c chai gen tri A v B hoa sbiu hin mu , nu chc 1 trong 2 alen tri hockhng c alen tri no th cy hoa c mu trng. Cho F1 Hoa c to ra t2 ging hoa trng thun

chng giao phn vi cy hoa trng c thhsau phn tnh theo tl3 : 5 trng. Kiu gen cy hoatrng em lai vi F1 l:

A AAbb.

B Aabb.

C AaBb.

D aaBB.

Cu 9 mt loi mu sc hoa do hai cp gen (Aa v Bb) khng cng lcut tng tc bsung hnh thnhnn. Trong , nu c chai gen tri A v B hoa sbiu hin mu , nu chc 1 trong 2 alen tri hockhng c alen tri no th cy hoa c mu trng. Php lai no sau y scho ton hoa :

A AAbb x Aabb.

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B aaBB x aaBb.

C aaBb x aabb.

D AABb x AaBB.

Cu 10 mt loi mu sc hoa do hai cp gen (Aa v Bb) khng cng lcut tng tc bsung hnh thnhnn. Trong , nu c chai gen tri A v B hoa sbiu hin mu , nu chc 1 trong 2 alen tri hockhng c alen tri no th cy hoa c mu trng. Cho lai c thdhp hai cp gen vi c thc kiu genAABb, kt quphn tnh F2 l

A 1 hoa : 1 hoa trng.

B 1 hoa : 3 hoa trng.

C 3 hoa : 1 hoa trng

D ton hoa .

Cu 11 Khi lai hai thb ng qutrn thun chng vi nhau thu c F1 gm ton b ng qudt. Cho F1tthphn thu c F2 c tlkiu hnh l 9 qudt : 6 qutrn : 1 qudi. Tnh trng hnh dng qubng

A do mt cp gen quy nh.

B di truyn theo quy lut tri ln khng hon ton.

C di truyn theo quy lut tng tc bsung.

D di truyn theo quy lut lin kt gen.

Cu 12 Khi lai cc cy u thun chng hoa trng vi nhau thu c F1 ton cy hoa . Cho F1 tthphnthu c F2 c tlkiu hnh 9 hoa : 7 hoa trng. C thkt lun php lai trn tun theo quy lut

A tng tc bsung.

B phn li c lp.

C phn li.

D tri ln khng hon ton.

Cu 13 Khi lai thun v nghch hai dng chut thun chng lng xm v lng trng vi nhau u c F1ton lng xm. Cho chut F1 tip tc giao phi vi nhau c F2 c 31 con lng xm v 10 con lng trng.Tnh trng mu sc lng chut di truyn theo quy lut

A phn li ca Menen.

B phn li c lp.

C tng tc bsung

D tri ln khng hon ton..

Cu 14 Trong php lai mt tnh trng, ngi ta thu c kiu hnh con lai l 135 cy hoa tm, 45 cy hoavng, 45 cy hoa v 15 cy hoa trng. Quy lut di truyn no sau y chi phi tnh trng mu hoa?

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A nh lut phn li c lp.

B Quy lut phn li.

C Tng tc gen kiu btr.

D Tri ln khng hon ton.

Cu 15 Cho cy hoa thun chng lai vi cy hoa trng thun chng thu c F1 ton hoa . Cho cccy F1 tthphn, thu c F2 c 215 cy hoa trng v 281 cy hoa . Tnh trng mu sc hoa di truyntheo quy lut

A Phn li c lp.

B tng tc cng gp.

C tng tc bsung.

D tri ln hon ton.

Cu 16 mt loi thc vt chc 2 dng mu hoa l v trng. Trong php lai phn tch mt cy hoa mu thu c thhlai phn li kiu hnh theo tl: 3 cy hoa trng : 1 cy hoa . C thkt lun, mu schoa c quy nh bi

A mt cp gen, di truyn theo quy lut lin kt vi gii tnh.

B hai cp gen lin kt hon ton.

C hai cp gen khng alen tng tc btr(bsung).

D hai cp gen khng alen tng tc cng gp.

Cu 17 mt loi thc vt, cho giao phn gia cy hoa thun chng vi cy hoa trng c kiu gen nghp ln (P), thu c F1 gm ton cy hoa . Tip tc cho cy hoa F1 giao phn trli vi cy hoatrng (P), thu c i con c kiu hnh phn li theo tl3 cy hoa trng : 1 cy hoa . Cho bit khng ct bin xy ra, shnh thnh mu sc hoa khng phthuc vo iu kin mi trng. C thkt lun musc hoa ca loi trn do

A mt gen c 2 alen quy nh, alen tri l tri khng hon ton.

B hai gen khng alen phn li c lp di truyn tri ln khng hon ton.

C mt gen c 2 alen quy nh, alen tri l tri hon ton.

D hai gen khng alen tng tc vi nhau theo kiu bsung quy nh.

Cu 18 mt loi thc vt, mu sc hoa l do stc ng ca hai cp gen (A,a v B,b) phn li c lp. GenA v gen B tc ng n shnh thnh mu sc hoa theo s :

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Cc alen a v b khng c chc nng trn. Lai hai cy hoa trng (khng c sc t) thun chng thu cF1 gm ton cy c hoa . Cho F1 tthphn, tlkiu hnh thu c F2 l

A 13 cy hoa : 3 cy hoa trng.

B 15 cy hoa : 1 cy hoa trng.

C 3 cy hoa : 5 cy hoa trng.

D 9 cy hoa : 7 cy hoa trng.

Cu 19 Cho hai dng b ng thun chng qutrn lai vi nhau, F1 100% qudt. Cho F1 giao phn vinhau c F2: 9 dt : 6 trn: 1 di. Nu cho F1 lai vi cy c kiu gen Aabb, tlphn li kiu hnh thhlai l

A 1 qudt : 2 qutrn : 1 qudi.

B 3 qudt : 4 qutrn : 1 qudi.

C 4 qudt : 3 qutrn : 1 qudi.

D 2 qudt : 1 qutrn : 1 qudi.

Cu 20 Php lai gia hai thu u cho hoa trng vi nhau. F1 ton bcy u cho hoa mu , cho cyF1 tthphn F2 thu c tlkiu hnh 9 cy cho hoa : 7 cy cho hoa trng. Nu cho F1 cy cho hoa, lai vi mt trong hai dng hoa trng P th khnng xut hin cy hoa trng i sau l

A 100 %.

B 25 %.

C 75 %.

D 50 %.

Cu 21 mt loi, hnh dng quc quy nh bi 2 cp gen khng alen: Kiu gen A-B- cho qudt;aabb cho qudi, cn li cho qutrn. Nu c th(p) AaBb giao phn vi nhau scho tlkiu hnh isau (F1) l

A 9 : 6 :1.

B 9 : 3 : 3 : 1.

C 13 : 3.

D 12 : 3 :1.

Cu 22 mt loi hoa, sc mt ca hai gen tri A v B trong cng kiu gen quy nh mu hoa , cc thp gen khc chc mt trong hai loi gen tri trn v kiu gen ng hp ln cho kiu hnh hoa mu trng.Cho hai cy hoa cha bit kiu gen lai vi nhau c F2 phn li theo tl3 : 5 trng. Kiu gen ca cc

cy em lai F1 l

A AaBb Aabb.

B AaBb AaBb

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C AaBb aabb.

D AaBb AAbb.

Cu 23 mt loi thc vt,cho F1 lai vi mt cy khc th F2 thu tl9 thn cao : 7 thn thp. F2 thu tl3 thn thp : 1 thn cao th F1 phi lai vi cy c kiu gen:

A AaBb

B AABb

C aaBb

D aabb

Cu 24 Giao phn gia hai cy (P) u c hoa mu trng thun chng, thu c F1 gm 100% cy c hoamu . Cho F1 tthphn, thu c F2 c kiu hnh phn li theo tl9 cy hoa mu : 7 cy hoa mutrng. Chn ngu nhin hai cy c hoa mu F2 cho giao phn vi nhau. Cho bit khng c t bin xyra, tnh theo l thuyt, xc sut xut hin cy hoa mu trng c kiu gen ng hp ln F3 l

A 1/81.

B 16/81.

C 81/256.

D 1/16.

Cu 25 mt loi thc vt, tnh trng mu sc hoa do hai gen khng alen phn li c lp quy nh. Trongkiu gen, khi c ng thi chai loi alen tri A v B th cho hoa , khi chc mt loi alen tri A hoc Bth cho hoa hng, cn khi khng c alen tri no th cho hoa trng. Cho cy hoa hng thun chng giao phnvi cy hoa (P), thu c F1 gm 50% cy hoa v 50% cy hoa hng. Bit rng khng xy ra t

bin, theo l thuyt, cc php lai no sau y ph hp vi tt ccc thng tin trn?

(1) AAbb AaBb (3) AAbb AaBB (5) aaBb AaBB

(2) aaBB AaBb (4) AAbb AABb (6) Aabb AABb

p n ng l:

A (2), (4), (5), (6).

B (3), (4), (6).

C (1), (2), (3), (5).

D (1), (2), (4).

Cu 26 chut, gen tri A quy nh lng mu vng, mt gen tri B khc c lp vi A quy nh lng muen, khi c mt c2 gen tri trn trong kiu gen th chut c mu xm, chut c kiu gen ng hp ln cmu kem. Cho chut c lng xm giao phi vi chut ci lng vng F1 nhn c tlphn tnh 3 lng

vng : 3 lng xm : 1 lng en : 1 lng kem. Chut b, mphi c kiu genA AABb x AaBb.

B AaBb x Aabb.

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C AaBb x AaBB.

D AaBb x aabb

Cu 27 chut, gen tri A quy nh lng mu vng, mt gen tri B khc c lp vi A quy nh lng muen, khi c mt c2 gen tri trn trong kiu gen th chut c mu xm, chut c kiu gen ng hp ln cmu kem. Tnh trng mu lng chut di truyn theo quy lut

A Phn li c lp.

B Tc ng btr.

C Phn li.

D Tri khng hon ton.

Cu 28 mt loi thc vt, khi cho cc cy thun chng P c hoa mu lai vi cy c hoa mu trng, F1thu c tt ccc cy c hoa mu . Cho cc cy F1 lai vi mt cy c mu trng, thhsau thu c tlkiu hnh l 5 cy hoa mu trng: 3 cy hoa mu . loi thc vt ny, kiu hnh con lai thu c l3 cy hoa mu trng : 1 cy hoa mu th kiu gen ca c them lai phi nh thno?

A AaBb x aabb

B Aabb x aaBb hoc AaBb x Aabb

C AaBb x Aabb

D AaBb x aabb hoc Aabb x aaBb

Cu 29 b cho lai cc cy thuc hai dng thun chng u c qudi vi nhau, thu c F1 ton cy qutrn. Cho cc cy F1 tthphn thu c F2 c tl9 qutrn : 7 qudi. Nu cho cc cy F2 qudi laingu nhin vi nhau th kt quFA l:

A 8 cy qutrn : 41 cy qudi.

B 100% cy qutrn.

C 41 cy qutrn: 8 cy qudi.

D 3 cy qudi : 1 cy qutrn.

Cu 30 mt loi, tnh trng vmu sc ht do hai gen khng alen quy nh. Cho ng ht trng giao phnvi ng ht trng thu c F1 c 361 ht trng, 241 ht vng v 40 ht . Tnh theo l thuyt, tlht trngF1 ng hp vchai cp gen trong tng sht trng F1 l

A 3/16.

B 1/8

C 1/6.

D 1/9.

Cu 31 mt loi thc vt, cho giao phn gia cy hoa thun chng vi cy hoa trng c kiu gen nghp ln (P), thu c F1 gm ton cy hoa . Tip tc cho cy hoa F1 giao phn trli vi cy hoatrng (P), thu c i F2 c kiu hnh phn li theo tl3 cy hoa trng : 1 cy hoa . Cho cc cy hoa

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trng F2 lai ngu nhin vi nhau. Tlphn tnh kiu hnh F3 l. Cho bit khng c t bin xy ra, shnh thnh mu sc hoa khng phthuc vo iu kin mi trng. C thkt lun mu sc hoa ca loitrn do.

A 3 : 5 trng.

B 5 : 3 trng.

C 1 : 17 trng.

D 11 : 3 trng.

Cu 32 Mt c thmang 4 cp gen dhp cng quy nh mt tnh trng theo tng tc btrtin hnh tth. Tn sxut hin 4 alen tri trong thp gen i con l

A 35/128.

B 5/32.

C 35/256.

D 23/128.

Cu 33 b ng, kiu gen A-bb v aaB- quy nh qutrn; kiu gen A- B- quy nh qudt; kiu gen aabbquy nh qudi. Cho b qudt dhp thai cp gen lai phn tch, i Fa thu c tng s160 qugm 3loi kiu hnh. Tnh theo l thuyt, squdi Fa l

A 75.

B 54

C 40

D 105.

Cu 34 Mt c thmang 4 cp gen dhp cng quy nh mt tnh trng theo tng tc btrtin hnh tth. Tn sxut hin 3 alen tri trong thp gen i con chim tll

A 28/128.

B 28/256

C 14/256

D 8/256.

Cu 35 Mt c thmang 4 cp gen dhp cng quy nh mt tnh trng theo tng tc btrtin hnh tth. Tn sxut hin thp gen cha 6 alen tri i con l

A 32/256.

B 7/64.

C 56/256.

D 18/64.

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Cu 36 Khi lai 2 thb trn khc nhau c tnh di truyn n nh ngi ta thu c F1 ng lot b dt, chocc cy b F1 tthphn, F2 thu c 3 loi kiu hnh vi tl: 9 dt : 6 trn : 1 di. Kiu gen ca thhPc thl

A AABB x aabb.

B AaBb x AaBb.

C AABB x aaBB.

D aaBB x AAbb

Cu 37 Mt loi thc vt nu kiu gen c c2 alen A v B cho mu hoa , cc kiu gen khc cho mu hoatrng. Khi tin hnh lai c thc 2 cp gen dhp vi cy c kiu gen AABB th kt quphn tnh F2 thuc l

A 1 hoa : 3 hoa trng

B 3 hoa : 1 hoa trng.

C 1 hoa : 1 hoa trng.

D 100% hoa .

Cu 38 Khi lai 2 ging b ng thun chng qudt v qudi vi nhau ta c F1 u c qudt. Cho F1lai vi b qutrn c F2: 152 b qutrn: 114 b qudt: 38 b qudi. Tnh theo l thuyt, trong sbqutrn thu c F2 th sb qutrn ng hp chim tl

A 1/4 .

B 3/4 .

C 1/3 .

D 1/8

Cu 39 em lai P thun chng khc nhau vkiu gen thu c F1. Cho F1 tthnhn c F2: 27 cy qutrn- ngt, 9 cy qutrn-chua, 18 cy qubu - ngt, 6 cy qubu -chua, 3 cy qudi - ngt, 1 cy qudichua. Bit vqudo 1 cp alen Dd quy nh. Tnh trng hnh dng quc chi phi bi quy lut ditruyn no?

A nh lut phn li.

B tng tc bsung.

C phn li c lp.

D tri khng hon ton.

Cu 40 em lai P thun chng khc nhau vkiu gen thu c F1. cho F1 tthnhn c F2: 27 cy qutrn- ngt, 9 cy qutrn-chua, 18 cy qubu - ngt, 6 cy qubu -chua, 3 cy qudi ngt, 1 cy qu

dichua. Bit vqudo 1 cp alen Dd quy nh. C2 cp tnh trng c chi phi bi quy lut di truynno?

A 2 cp gen quy nh 2 tnh trng xy ra hon vgen.

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B 2 cp gen quy nh 2 tnh trng phn li c lp.

C 3 cp gen quy nh 2 tnh trng, 3 cp gen phn li c lp nhau.

D 3cp gen quy nh 2 tnh trng nm trn 2 cp NST tng ng v lin kt gen.

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Bi 7.Tng tc gen bsung (btr) -2Cu 1 mt loi thc vt, tnh trng mu hoa do hai gen khng alen tng tc vi nhau quy nh. Nu trongkiu gen c chai loi alen tri A v B th cho kiu hnh hoa ; nu chc mt loi alen tri A hoc B hockhng c alen tri th cho kiu hnh hoa trng. Lai hai cy (P) c hoa trng thun chng vi nhau thu cF1 gm ton cy hoa . Cho cy F1 lai vi cy hoa trng c kiu gen ng hp ln vhai cp gen ni trnthu c Fa. Bit rng khng c t bin xy ra, tnh theo l thuyt, tlphn li kiu hnh Fa lA 9 cy hoa trng : 7 cy hoa .B 3 cy hoa : 1 cy hoa trng.C 1 cy hoa trng : 1 cy hoa .D 3 cy hoa trng : 1 cy hoa .

Cu 2 Khi P c n cp gen dhp phn li c lp cng tng tc vi nhau hnh thnh ln mt tnh trng,th sphn li kiu hnh F1 sl mt bin dng ca strin khai biu thcA (1 : 2 : 1)n.

B 9 : 3 : 3 : 1.

C 9 : 7.

D (3 : 1)n.

Cu 3 mt loi thc vt, tnh trng vmu sc hoa do hai gen khng alen quy nh. Cho cy hoa tm giaophn vi cy hoa tm thu c F1 c 163 cy hoa tm, 107 cy hoa v 18 cy hoa trng. Tnh theo lthuyt, tlcy hoa F1 dhp trong scy hoa F1 lA 2/3. B 3/8. C 1/8. D 1/6.

Cu 4 Cho 1 cy tthphn, F1 thu c 56,25% cy cao, 43,75% cy thp. Cho giao phn ngu nhin cccy cao F1 vi nhau. Vmt l thuyt th tlcy cao thu c F2:A 23,96%.

B 52,11%.

C 79,01%.

D 81,33%.Cu 5 em lai P thun chng khc nhau vkiu gen thu c F1. Cho F1 tthnhn c F2: 108 cy ,cao; 36 cy , thp; 84 cy trng, cao; 28 cy trng, thp. Bit chiu cao do 1 cp alen Dd quy nh. Kiugen ca P l mt trong bao nhiu trng hp?A 1

B 4

C 2

D 3

Cu 6 em lai P thun chng khc nhau vkiu gen thu c F1. Cho F1 tthnhn c F2: 27 cy qutrn- ngt, 9 cy qutrn-chua, 18 cy qubu - ngt, 6 cy qubu -chua, 3 cy qudi - ngt, 1 cy qudichua. Bit vqudo 1 cp alen Dd quy nh. Cho F1 giao phi vi c thkhc, thu c F2 c tl3cy trn- qungt: 6 cy bu- qungt: 3 cy di- qungt:1 cy trn- quchua: 2 cy bu- quchua: 1 cydi- quchua. Kiu gen ca c thlai vi F1 l:A aaBbDd.

B aabbDd.

C AaBbdd.

D aaBbDd.

Cu 7 em lai P thun chng khc nhau vkiu gen thu c F1. Cho F1 tthnhn c F2: 27 cy qutrn- ngt, 9 cy qutrn-chua, 18 cy qubu - ngt, 6 cy qubu -chua, 3 cy qudi - ngt, 1 cy qu

dichua. Bit vqudo 1 cp alen Dd quy nh. em F1 giao phi vi c thkhc kt quxut hin tlkiu hnh: 1: 2: 1: 1: 2: 1. Kiu gen ca c them lai vi F1 l mt trong sbao nhiu trng hp:A 4

B 2

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C 3

D 1

Cu 8 em lai P thun chng khc nhau vkiu gen thu c F1. Cho F1 tthnhn c F2: 27 cy qutrn- ngt, 9 cy qutrn-chua, 18 cy qubu - ngt, 6 cy qubu -chua, 3 cy qudi - ngt, 1 cy qudichua. Bit vqudo 1 cp alen Dd quy nh. Kt qulai gia F1 vi c thkhc cho tlphn li kiuhnh: 12: 9: 4: 3: 3: 1. C bao nhiu s lai ph hp vi kt qutrn:A 1

B 4

C 2

D 3

Cu 9 em lai P thun chng khc nhau vkiu gen thu c F1. Cho F1 tthnhn c F2: 27 cy qutrn- ngt, 9 cy qutrn-chua, 18 cy qubu - ngt, 6 cy qubu -chua, 3 cy qudi - ngt, 1 cy qudichua. Bit vqudo 1 cp alen Dd quy nh. Kt qulai gia F1 vi c thkhc cho tlphn li kiuhnh: 4: 4: 3: 3: 1: 1. sphp lai ph hp vi kt qutrn:A 4

B 1

C 6D 2

Cu 10 em lai P thun chng khc nhau vkiu gen thu c F1. Cho F1 tthnhn c F2: 27 cy qutrn- ngt, 9 cy qutrn-chua, 18 cy qubu - ngt, 6 cy qubu -chua, 3 cy qudi - ngt, 1 cy qudichua. Bit vqudo 1 cp alen Dd quy nh. Kt qulai gia F1 vi c thkhc cho tlphn li kiuhnh: 9: 9: 6: 6: 1: 1. Kiu gen ca c thlai vi F1 lA AaBbdd.

B AaBbDd.

C Aabbdd.

D aaBbdd.Cu 11 Khi lai 2 ging b ng thun chng qudt v qudi vi nhau c F1 u c qudt. Cho F1 laivi b qutrn c F2: 152 b qutrn: 114 b qudt: 38 b qudi. Hnh dng qub chu schi phica hin tng di truynA phn li c lp.B lin kt hon tonC tng tc bsungD tri khng hon t