In cattle of the Shorthorn breed, genes of red and white color in a heterozygous state give a roan suit.

In cattle of the Shorthorn breed, genes of red and white color in a heterozygous state give a roan suit. What part of the offspring from crossing two roan parents should be roan?

Let’s designate the gene that causes the development of red coat in cows of the Shothorn breed as B, and the gene that leads to the development of white coat as C. Shotgorn cows of the roan suit, according to the condition of the problem, will be BC. Such bulls and cows will produce germ cells B and C.

The offspring obtained from crossing such bulls and cows will look like:

red calves (BB) – 25%;

roan shothorn calves (BC) – 50%;

white shotguns (CC) – 25%.

Answer: 1/2 or 50% of the shothorn calves will be roan.