In Drosophila, gray dominates over black. When gray parents were crossed, the offspring turned out

In Drosophila, gray dominates over black. When gray parents were crossed, the offspring turned out to be in a ratio of 3: 1. What about the genotypes of parents and offspring?

The splitting obtained in the offspring of Drosophila is a typical splitting according to the genotype when individuals that are heterozygotes are crossed with each other. We write them as Bb, designating the gray gene as B, and the black gene as b.

Such flies produce germ cells B and b.

The offspring is as follows:

gray baby flies – homozygotes for the dominant gene (BB) – 25%;

gray cubs – heterozygotes (BB) – 50%;

black baby flies are homozygotes (bb) – 25%.

The result obtained confirms the assumption.