The reason for the darker fur on the tail, ears, nose, and legs of a Siamese cat is
A)incomplete dominance.
B)the activity of a heat-sensitive enzyme involved in melanin production.
C)quantitative inheritance.
D)epistasis.
E)the presence of different alleles for fur color in these regions.

Question

Quizplus · Accepted Answer

The darker fur on these specific areas of a Siamese cat is due to the activity of a heat-sensitive enzyme involved in melanin production. This enzyme is only active in cooler parts of the body, such as the extremities, which causes the melanin to be produced in those areas and results in darker fur. This is an example of temperature-sensitive pigment expression, which is unique to Siamese cats.

The Reason for the Darker Fur on the Tail, Ears