Crossing a White Leghorn (CCII) chicken with another White Wyndot (ccii) chicken produces a white chicken in the F1 line. Self-fertilization of white (CcIi) chickens in the F1 generation resulted in 13 white and 3 colored chickens in the F2 generation.
here,
White Leghorn chicken genotype CCII
White Wyndot chicken genotype ccii
The first progeny is F1 and the second progeny is F2
Parents : ♂ × ♀
Phenotype: White Leghorn White Wyndot
Genotype: CCII ccii
Gamete : (CI) (ci)
F1 Generation : CcIi (White)
Svanishek : F1×F1
Parents : ♂ × ♀
Phenotype: White White
Genotype : CcIi CcIi
Gamete : (CI)(Ci)(cI)(ci) (CI)(Ci)(cI)(ci)
F2 generation (checker board)
Comment: It can be seen from the checker board, out of 16 chickens, 13 are white and 3 are colored chickens. In this case the expressed gene I non-allele inhibits expression of the expressed gene C.
Phenotypic ratio : White : Colored = 13 : 3