All calico cats are female because
A) two recessive X-linked genes are required for the calico phenotype.
B) Y-linked genes prevent the expression of the calico phenotype.
C) the calico phenotype is caused by random X chromosome inactivation.
D) the calico phenotype is a Y-linked trait.
E) one X chromosome and one Y chromosome are needed for the expression of the calico phenotype.

Question

Quizplus · Accepted Answer

The calico phenotype in cats is due to the random inactivation of one of the two X chromosomes in females, leading to the expression of different color genes on the active X chromosomes in different cells. This phenomenon does not occur in males, as they have only one X chromosome.

All Calico Cats Are Female Because