In cats, the dominant allele of the X-linked orange gene is required to produce orange fur; the…

In cats, the dominant  allele of the
X-linked orange gene is required to produce orange fur; the recessive o allele
of this gene yields black fur.

a. Tortoiseshell cats have coats with
patches of orange fur alternating with patterns of black fur. Approximately 90%
of all tortoiseshell cats are females. What type of crosses would be expected
to produce female tortoiseshell cats?

b. Suggest a hypothesis to explain the
origin of male tortoiseshell cats.

c. Calico cats (most of which are females)
have patches of white, orange, and black fur. Suggest a hypothesis for the
origin of calico cats.