You have flock of black chickens and white chickens You want

You have flock of black chickens and white chickens. You want to select a black chicken. but only if it is homozygous. How could you determine if the black chicken you select is heterozygous or homozygous?

Solution

Answer

Black. BB or BB

White. bb

The black chickens is identified whether it is homologous or heterogeneous by test cross

If the black chickens are crossed with white (bb), black and white progeny are produced in 1:1 ratio, then we can say that the black is heterozygous.

Bb. X. bb

Bb(50%), bb(50%)

If the black is crossed with white, all the progeny are black, then we can say that the black is homozygous.

BB. X. bb

Bb100%)