NEET Class neet Answered
In a cross between AABB X aabb , the ratio of F2 genotype between AABB,AaBB,Aabb and aabb would be
[I have read this chapter in detail, but still I am not able to solve these type of questions, so please tell me how should I improve myself to master this chapter.Also please explain this question in detail.]
(a)9:3:3:1
(b)2:1:1:2
(c)1:2:2:1
(d)7:5:3:1
Asked by Balbir | 30 Dec, 2019, 10:18: PM
Expert Answer
Dihybrid cross AABB and aabb
Parental cross: AABB × aabb
Gametes: AB ab
F1 Generation: AaBb
Gametes: AB, Ab, aB, ab
F2 Generation:
|
|
AB |
Ab |
aB |
ab |
|
AB |
AABB |
AABb |
AaBB |
AaBb |
|
Ab |
AABb |
AAbb |
AaBb |
Aabb |
|
aB |
AaBB |
AaBb |
aaBB |
aaBb |
|
ab |
AaBb |
Aabb |
aaBb |
aabb |
AABB : AaBB : Aabb : aabb = 1 : 2 : 2 : 1
So, the correct option is c - ‘1:2:2:1’.
In such problems, it is best to draw a Punnett square for the progeny formed from the gametes. Write down the combinations and then assess the genotypic and phenotypic ratios.
Answered by Sheetal Kolte | 31 Dec, 2019, 12:50: PM
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