The standard minks are brown, while the Aleutian ones are bluish gray. The brown color is dominant.

The standard minks are brown, while the Aleutian ones are bluish gray. The brown color is dominant. When two brown individuals were crossed, some of the offspring turned out to be bluish-gray. What are the genotypes of parents and offspring?

Let us designate the gene that causes the development of brown fur in minks as C, and the gene that leads to the development of bluish-gray (Aleutian) fur as c.

Individuals with bluish-gray fur will be recorded as cc, because homozygosity is necessary for the phenotypic realization of this trait.

To be the parents of mink colored in this way, brown parent individuals must be heterozygous, that is, carry the recessive gene c in their genotype. We write them as Cc, and the sex cells that they produce are c and C.

The offspring of such minks will look as follows:

minks with brown fur (CC, Cc) – 75%;

minks with bluish-gray fur (сс) – 25%.

Answer: parents are heterozygotes (Cc), blue-gray cubs are homozygotes for the gene for the recessive trait (cc), the rest of the cubs are brown heterozygotes (Cc).