In chickens, a gene for feather pattern is located on the Z chromosome, with Bar

Question

In chickens, a gene for feather pattern is located on the Z chromosome, with Barred feathers being dominant to wild-type feathers. A second gene for comb shape is autosomal, with wild-type combs being dominant to single combs. In the P generation, a cross is performed between a female homozygous for wild-type feathers and single combs and a male homozygous for barred feathers and wild-type combs. Indicate the phenotype of the F1 male and female offspring from this cross. Perform a cross between these F1 males and females and list the genotypes, phenotypes, and their ratios among the F2 generation of progeny.

Explanation / Answer

Given that, barred feathers are dominant to wild-type feathers. Thus, the genotype of barred feathers is BB or Bb and the wild type feathers is bb. Wild-type combs being dominant to single combs, thus, the genotype of wild type feathers is Ww or WW and the genotype of singl combs is ww.

Cross between a female homozygous for wild-type feathers and single combs and a male homozygous for barred feathers and wild-type combs- the genotype of parenral generation is bbww* BBWW.

The genotype of F1 generation is, 100%BbWw

Cross between F1 generation is, BbWw* BbWw. The genotype of F2 generation is, 1/16 BBWW (Barred feathers, wild type combs), 1/8 BBWw (Barred feathers, wild type combs), 1/16 BBww (Barred feathers, single combs),  1/8 BbWW (Barred feathers, wild type combs), 1/4 BbWw (Barred feathers, wild type combs), 1/8 Bbww Barred feathers, single combs), 1/16 bbWW (wild type feathers, wild type combs), 1/8 bbWw (wild type feathers, wild type combs), 1/16 bbww (wild type feathers, single combs).

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