The gene for the black suit of cattle dominates over the gene for the red suit. What F1 offspring will

The gene for the black suit of cattle dominates over the gene for the red suit. What F1 offspring will result from crossing a purebred black bull with rac cows? what offspring F2 will result from crossing hybrids with each other.

Let us designate the gene that causes the development of black coat in cattle as K, then the gene for the red coat of cattle will be designated as k.

By “purebred” is usually meant the homozygosity of the genotype.

A purebred black bull has the KK genotype and is capable of producing only one type of sperm, K.

Red cows will have the kk genotype homozygous for the recessive gene, because homozygosity is a prerequisite for the phenotypic realization of the red color. These cows produce eggs of the same type – k.

All F1 offspring will be heterozygous black-haired Kk calves. These hybrid individuals are capable of producing sex cells of two types – K and k.

When the resulting hybrids are crossed with each other, the F2 offspring will be obtained, including the following possible options:

homozygote calves with black hair (KK) – 25%;

heterozygote calves with black hair (Kk) – 50%;

Heterozygote calves with red hair (kk) – 25%.