試題詳解

14. 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 an orange female and a black male?
(A) tortoiseshell females； tortoiseshell males
(B) tortoiseshell females； orange males
(C) orange females； orange males
(D) black females； orange males