In chickens, white plumage dominates the colored one, and the pink-shaped ridge – over the leaf-shaped one

In chickens, white plumage dominates the colored one, and the pink-shaped ridge – over the leaf-shaped one. Heterozygous pink-combed white hen crossed with a painted pink-combed rooster, kt is the offspring of a white leaf-combed hen (Find F1. Sign phenotypes and genotypes of all individuals)

Let’s designate the gene that causes the white plumage of chickens as B, then the gene for the colored plumage will be b.

Let’s designate the gene that leads to the development of the pink-shaped ridge as C, then the gene of the leaf-shaped ridge will be c.

A white chicken with a pink-shaped rowing shape, according to the condition of the problem, is heterozygous – BbCc. It produces eggs BC, bc, bC and Bc.

A painted cockerel with a pink-shaped comb is a descendant of a chicken showing a recessive trait, therefore, according to the shape of the comb, the cock is heterozygous. Its feathers are colored, which is possible only with homozygosity for the gene of this trait. Therefore, the cock is bbCc, the sperm produced by it are bC and bc.

All offspring from the data of a rooster and a hen will look like this:

white chickens with a pink comb (BbCC, 2BbCc);

painted chickens with a pink comb (2bbСс, bbСС);

dyed chickens with a leaf-shaped crest (bbcc);

white chickens with a leaf-shaped crest (Bbcc).