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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?

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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

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