Brown mouse (CC) crossed with gray mouse (cc). Hybrid mice interbreed with each other.

Brown mouse (CC) crossed with gray mouse (cc). Hybrid mice interbreed with each other. What kind of offspring will they get?

A brown mouse with the CC genotype is capable of producing only the same type of eggs C. The gray mouse, homozygous for the gene for the recessive trait, produces the same type of eggs c.

All hybrid mice have a heterozygous Cc genotype and brown hair. They are capable of producing germ cells of two types – C and c. When such mice are crossed among themselves, the offspring will be represented by the following options:

gray-haired mice (cc) – 25%;

homozygous brown-haired mice (CC) – 25%;

heterozygous brown-haired mice (Cc) – 50%.

Parents SS * cc

Gametes C (from SS) c (from cc)

F1 100% Cc

Gametes F1 C, c

F2 25% CC, 50% CC, 25% CC