In a dihybrid cross AaBb times AaBb what fraction of the off

In a dihybrid cross AaBb times AaBb what fraction of the offspring will be homozygous for both recessive traits? 1/16 1/8 3/16 1/4 3/4

Solution

For AaBb x AaBb

AB

Ab

aB

ab

AB

AABB

AABb

AaBB

AaBb

Ab

AABb

AAbb

AaBb

Aabb

aB

AaBB

AaBb

aaBB

aaBb

ab

AaBb

Aabb

aaBb

aabb

So we can say there is 1/16 possibility that the offspring would have homozygous for both recessive traits. Recessive traits are governed by recessive genes ( a and b in this question) and homozygous condition is aabb. So the option A is correct.

	AB	Ab	aB	ab
AB	AABB	AABb	AaBB	AaBb
Ab	AABb	AAbb	AaBb	Aabb
aB	AaBB	AaBb	aaBB	aaBb
ab	AaBb	Aabb	aaBb	aabb