Calico cats are female because
A)the males die during embryonic development.
B)a male inherits only one of the two X-linked genes controlling hair colour.
C)the Y chromosome has a gene blocking orange colouration.
D)only females can have Barr bodies.
E)multiple crossovers on the Y chromosome prevent orange pigment production.

Question

Quizplus · Accepted Answer

Calico cats have patches of orange and black fur due to the expression of different alleles on the X chromosome. Since females have two X chromosomes, they can express both alleles and have the patchy fur pattern. However, males only inherit one X chromosome, which determines their coat color, so they cannot be calico.

Calico Cats Are Female Because