When crossing red cows with a white bull, all the calves are roan. When roan cows were crossed with a roan bull

When crossing red cows with a white bull, all the calves are roan. When roan cows were crossed with a roan bull, 10 red calves, 19 roans and 9 white calves were obtained. What offspring, and in what ratio, can you get from crossing a roan cow with a white bull?

In this problem, inheritance is observed according to the type of incomplete dominance, which is confirmed by the characteristic splitting in the offspring of 1: 2: 1.

The genotype of red cows is AA, the genotype of roan cows is Aa, and the genotype of white cows is aa.

R: Aa x aa – parental individuals;

G: A, and x a – possible gametes;

F: Aa – 50% roan cows;

aa – 50% white cows.

In the offspring, roan and white cows are obtained with a ratio of 1: 1.