In cows of the Shorthorn breed, the red color dominates over the white one, and in the heterozygous

In cows of the Shorthorn breed, the red color dominates over the white one, and in the heterozygous state the animals have a variegated color. The breeder creates a herd by crossing variegated cows with a red bull. What percentage of calves are white?

From the condition of the problem, it should be concluded that we are talking about incomplete dominance, when the heterozygous genotype in the phenotype is manifested as an intermediate trait.

Let’s designate the dominant gene that causes the red suit in the homozygous variant as “A”, the recessive gene that causes the white suit in the homozygous variant – “a”.

White cows will have genotype aa, red cows – AA, variegated – Aa.

The AA red bull is capable of producing type A gametes. Variegated Aa cows are A and a gametes.

The offspring of a red bull and variegated cows will have genotypes: AA (50%), Aa (25%) and aa (25%).

Answer: 25% of calves will have a white coat.