In cats, the genes for black (B) and red (A) color are sex-linked and located on the X chromosome.

In cats, the genes for black (B) and red (A) color are sex-linked and located on the X chromosome. A tortoiseshell cat and a black cat gave birth to ginger and tortoiseshell kittens. Indicate the genotype and sex of the ginger kitten.

Let’s designate the chromosome containing the gene that causes the development of black hair in cats as XB, then the chromosome with the red hair gene will be XA.

Tortoiseshell coat color will be found only in female cats – XBXA. The tortoiseshell cat’s body will produce XB and XA eggs.

The black cat will be recorded as XBY, it will produce sperm cells XB and Y.

All possible offspring of the described pair of cats will look like this:

XBXB – black cats 25%;

XBXA – two-color cats 25%;

XВY – black cats 25%;

XАY – cats with red hair 25%.

Answer: red kitten – male, XАY.