In guinea pigs, chinchilla fur color partially dominates over white (in the heterozygous state – semi-dark color)

In guinea pigs, chinchilla fur color partially dominates over white (in the heterozygous state – semi-dark color), and wavy coat dominates over smooth coat. Traits are inherited independently. What is the probability of offspring with semi-dark fluffy fur when crossing two diheterozygous guinea pigs?

Let’s designate the gene that causes the homozygous chinchilla coloration of the fur of guinea pigs as B, then the gene for the white color of their fur will be b. Guinea pigs with semi-dark fur will be recorded, according to the condition, as Bb.

Let’s designate the gene that causes the development of tufted hair in guinea pigs as C, then the gene for smooth hair will be c.

Diheterozygous parents will be recorded as BbCc. Such animals produce bc, BC, Bc and bC germ cells.

The offspring from crossing such guinea pigs with each other will look like this:

chinchilla curled cubs (BBCC, 2BBCC, BBcc);

semi-dark swirling cubs (4BbСс, 2BbСС);

white curly cubs (bbcc, 2bbcc);

white smooth cubs (bbcc);

semi-dark smooth cubs (2Bbcc).

Semi-dark curly cubs: 6 out of 16 genotypic variants, or 37.5%

Answer: 37.5%.