Question

The offspring of aabb into aabb is crossed with aabb the genotypic ratio of progeny will be

Answer 1

Explanation:

when AaBb crossed with aabb then , AaBb produces 4 types of gamates i.e AB, Ab, aB and ab etc. And aabb produces only one type of gamate i.e ab. The punnet squre of this cross will be

The cross produces 4 progeny, and all are different from each other in appearance so the phenotypic ratio will be 1:1:1:1.

This type of cross is called as ‘test cross’ .

Test cross is one type of ‘back cross’ in which the f1 generation progeny is crossed with it's recessive parent .

Again back cross is a process in which the f1 generation progeny is crosssed with any one of it's parents.

As here we crossed the progeny with it's recessive parent, so it will be called as test cr