The color gene in cats is linked to the X-sex chromosome. Black color is determined by the genome – Xb, red genome – Xb, heterozygotes have a tortoiseshell color. Several kittens were born from a tortoiseshell cat, one of which turned out to be a ginger cat. Make a scheme for solving the problem. Determine the genotypes and phenotypes of the parents and their offspring, the character of inheritance of the coat color trait.
1) Genotypes and phenotypes of parents: tortoiseshell cat – XBXb (gametes: Xb, Xb) x ginger cat – XbY (gametes: Xb, Y); 2) Genotypes and phenotypes of offspring: tortoiseshell cats – XBXb, red cats – XbXb, black cats – XBY, red cats – XbY; 3) Intermediate inheritance of the trait, linked to the sex, is manifested.
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