question_answer

When a cross is conducted between black feathered hen and a white-feathered cock, blue-feathered fowls are formed. When these fowls are allowed for interbreeding, in \[{{\text{F}}_{2}}-\]generation, there are 20 blue fowls. What would be the number of black and white fowls?

A)  Black 20, white 10

B)  Black 20, white 20

C)  Black 10, white 10

D)  Black 10, white 20

Correct Answer: C

Solution :

 Black feathered hen = BB White feathered cock = bb Blue feathered fowl = Bb Phenotypic ratio is 1: 2 : 1 Bluef6wl \[\text{=}\,\,\text{50 }\!\!%\!\!\text{ }\,\text{=}\,\text{20}\] Black fowl\[=25%=10\] White fowl \[=25%=10\]