Question

Which one of the following crosses shows the phenotypic ratio of 3:1?

• A. $AaBb\times AaBb$
• B. $aabb\times AABb$
• C. $Aabb\times Aabb$
• D. $AaBb\times aabb$

Answer 1

Answer: (C)

When parents of genotype Aabb is crossed with Aabb we get the following progenies.

	Ab	ab
Ab	AAbb	Aabb
ab	Aabb	aabb

Phenotypic ratio will be $3:1$
Genotypic ratio will be $1:2:1$