On the poultry farm, one layer had 26 chickens, of which 13 white and 13 dark birds grew.

On the poultry farm, one layer had 26 chickens, of which 13 white and 13 dark birds grew. Determine the genotype and phenotype of the parents and which trait was dominant.

1) Dark color, as a rule, is the dominant trait, light color is recessive. Therefore:

A – black color of plumage, and – white color.

2) Find the phenotype cleavage. This will suggest what genotypes the parents had.

In total – 26 chickens. Of these, 13 (i.e. 50%) are black, 13 are white. Therefore, the phenotype ratio is 1: 1.

3) Such splitting occurs when a heterozygote and a homozygote are crossed for a recessive allele.

The genotypes of the parents are Aa (black plumage) and aa (white).