In cats, the gene for black hair color (B) dominates over the gene for red hair (c), and the gene for short hair (S)

In cats, the gene for black hair color (B) dominates over the gene for red hair (c), and the gene for short hair (S) dominates over the gene for long hair (s). What is the expected proportion of individuals with black short hair from crossing a dihybrid cat for both traits with a hybrid black long haired cat?

According to the introduced designations, we will write down the genotypes of the parent individuals.

A cat that is dihybrid in both traits will be BvSs, which will be expressed in her black short coat. Such a cat will produce BS, BS, BS and BS eggs.

The hybrid long-haired black cat will be Bbs and will produce Bs and Bs sperm.

All probable offspring of a given pair of cats will look like this:

black shorthaired kittens (BBSs, 2 BBSs);

black long-haired kittens (2 BBss, BBss);

red long-haired kittens (bbss);

ginger shorthair kittens (bbSs).

The proportion of kittens with black short hair will be 3/8.

Answer: 3/8.