Question

In cats, orange coat color is determined by the b allele, and black coat color is determined by the B allele. The heterozygous condition results in a coat pattern known as tortoiseshell. This gene is X-linked. Part A What kinds of offspring would be expected from a cross of an orange male and a tortoiseshell female?

Answer 1

Answer:

Xᵇ Xᴮ : tortoiseshell female;

Xᵇ Xᵇ : orange female;

Xᴮ Y: black male;

Xᵇ Y: orange male.

Explanation:

The possible genotypes and phenotypes for coat color in cats is:

Females

• XᵇXᵇ: orange
• XᴮXᴮ: black
• XᴮXᵇ: tortoiseshell

Males

• XᵇY: orange
• XᴮY: black

Cross of an orange male and a tortoiseshell female

XᵇY x XᴮXᵇ

The male produces the gametes Xᵇ and Y; the female produces the gametes Xᴮ and Xᵇ.

The expected offspring resulting from the combination of those gametes is:

• Xᵇ Xᴮ : tortoiseshell female
• Xᵇ Xᵇ : orange female
• Xᴮ Y: black male
• Xᵇ Y: orange male