In cats, the gene for coloration is linked to the X chromosome. HV red color of the coat;

In cats, the gene for coloration is linked to the X chromosome. HV red color of the coat; Xb black color of wool. Heterozygotes XB Xb have a tortoiseshell (tricolor) coloration. A black cat has a three-color kitten. What is its gender? What color did the father of this kitten have? What other kittens could have been born to this couple? Determine the genotypes and phenotypes of the offspring.

Since a male kitten will have in its genotype only one chromosome containing information about the color of the coat, and two chromosomes are needed for the tortoiseshell phenotype to manifest, it can be concluded that the tortoiseshell kitten is female, XBXb. The black cat, according to the condition of the problem, will be XbXb. Her body will produce the same type of Xb gametes. To get a tortoiseshell kitten, the cat must transmit XB to him, therefore, he himself has a red coat and produces sperm XB and Y.

All possible kittens of this parental pair of individuals:

XBXb – female tortoiseshell kittens, 50%;

XbY – male black kittens, 50%.