The red-eyed gray Drosophila, heterozygous for the second trait, is crossed with the homozygous red-eyed

The red-eyed gray Drosophila, heterozygous for the second trait, is crossed with the homozygous red-eyed Black Drosophila. In what numerical ratio is splitting by genotype and phenotype expected in offspring, if red eyes and gray body are dominant traits?

Let’s designate the gene that determines the development of red eyes in Drosophila as C, then the gene for eyes of a different color will be designated as c.

Let’s designate the gene for the gray body color of Drosophila as P, then the gene for the black body color of this fly will be designated as p.

The red-eyed gray fruit fly, heterozygous for the second trait, will be recorded, according to the introduced designations, as CCPp. Such a Drosophila will produce two types of germ cells – CP and Cp.

Homozygous red-eyed black fruit fly – CCpp. It produces germ cells of the same type – Cp.

The offspring from crossing the described flies with each other will be represented by two options:

red-eyed flies with a gray body (CCPp) – 50%;

red-eyed flies with a black body (CCpp) – 50%.

Genotypic and phenotypic cleavages in this case coincide and correspond to a 1: 1 ratio.