A homozygous cock with a comb (A) and feathered legs (B) was crossed with a heterozygous chicken with a comb and bare legs
May 29, 2020 | Education
| A homozygous cock with a comb (A) and feathered legs (B) was crossed with a heterozygous chicken with a comb and bare legs (genes are not linked). The male and female of the first generation, having different genotypes, were crossed with each other. Identify the parental genotypes, genotypes, and phenotypes of first and second generation hybrids.
1) Parent genotypes: AABB (gametes AB) and Aabb (gametes Ab, ab).
2) Genotypes of the first hybrid generation – AA Bb and AaBb (all with a comb and feathered legs).
3) Phenotypes and genotypes of the second generation:
6/8 (3/4) with a comb and legs supported:
1AABB: 2AABb: 1AaBB: 2AaBb
2/8 (1/4) with a comb and bare feet:
1AAbb: 1Aabb
