The gene for the horned suit of cattle dominates over the gene for the hornless (hornless) suit.

The gene for the horned suit of cattle dominates over the gene for the hornless (hornless) suit. What offspring (F1) will result from crossing a purebred horned bull with hornless cows? What will the F2 offspring be from crossing such hybrids with each other? Which calves will be born from a horned bull and hybrid cows from F1?

Let’s designate the gene that determines the development of horns in cattle as K, then the hornless gene will be designated as k.
By “purebred” is usually meant the homozygosity of the genotype. Let’s designate a purebred horned bull as KK. It is capable of producing one type of sperm, K.
Hornless cows have a genotype kk homozygous for the hornless gene and produce eggs of the same type, k.
All F1 offspring are uniform and are represented by heterozygous Kk calves with horns. In turn, these individuals are capable of producing sex cells of two types, K and k. When crossing heterozygotes with each other, the offspring will be represented by the options:
homozygote horned calves (KK) – 25%;
heterozygote horned calves (Kk) – 50%;
hornless homozygote calves (kk) – 25%.
A purebred horned bull (KK, gametes – K) when crossed with a hybrid horned cow (Kk, gametes – k and K) will give offspring consisting of horned calves, both homozygous (KK – 50% of the offspring) and heterozygous (Kk – 50 %).