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In cats, black fur color is caused by an X-linked allele; the other allele at this locus causes orange color. The heterozygote is tortoiseshell. What kinds of offspring would you expect from the cross of a black female and an orange male?
A) tortoiseshell female; black male
B) black female; orange male
C) tortoiseshell female; tortoiseshell male

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Answer:

A) tortoiseshell female; black male

Explanation:

Females have two X chromosomes and males have an X and a Y chromosome.

The possible genotypes and phenotypes are:

  • Xáµ’Xáµ’: black female
  • Xáµ’Y: black male
  • Xá´¼Xá´¼: orange female
  • Xá´¼Y: orange male
  • Xáµ’Xá´¼: tortoiseshell female

Cross of a black female and an orange male

XᵒXᵒ  x  XᴼY

The female only produces Xáµ’ gametes. The male produces Xá´¼ and Y.

The possible offspring therefore is:  XᵒXᴼ (tortoiseshell females) and XᵒY (black males). The answer is A.

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