Question

The offspring of AAbb $\times$ aaBB is crossed with aabb. The genotypic ratio of progeny will be

• A. 9 : 3 : 3 : 1
• B. 1 : 2 : 1
• C. 1 : 1 : 1 : 1
• D. 4 : 1

Answer 1

Answer: (C)

1 : 1 : 1 : 1

Parent generation : AAbb x aaBB

F${}_1$ generation : AaBb

P${}_2$ generation : AaBb x aabb

Gametes AaBb --> aabb	AB	Ab	aB	ab
ab	AABb	Aabb	aaBb	aabb

Genotypic ratio = 1 AABb : 1 Aabb : 1 aaBb : 1 aabb. Correct answer is C.