Crossing a black (BB) chicken with another white (bb) chicken results in a bluish-grey (Bb) chicken in the F1 line. Self-fertilization of F1 progeny with bluish-brown (Bb) chickens resulted in 1 black, 2 brown and 1 white chicken in the F2 progeny.
here,
The gene responsible for black color is B
Hence, the black genotype is BB
again,
Gene responsible for white color b
As a result, the genotype bb is white
The first progeny is F1 and the second progeny is F2
Parents : ♂ × ♀
Phenotype: Black and white
Genotype : BB bb
Gamit : (B) (b)
Season 1: Bb (Blue Dhusar)
Svanishek : F1×F1
Parents : ♂ × ♀
Phenotype: Bluish Grey
Genotype: Bb Bb
Gamit : (B) (b) (B) (b)
F2 progeny (checker board)
Comment: It can be seen from the checker board, out of 4 chickens, 1 is black, 2 are blue-grey and 1 is white. Chickens are bluish gray rather than black due to incomplete expression of the expression gene B.
Phenotypic Ratio : Black : Blue Gray : White = 1:2:1