Siamese Cats Have Enzymes That Code for Dark Fur Color

Multiple Choice

Siamese cats have enzymes that code for dark fur color but are only active in cooler temperatures.Thus,the tips of a Siamese cat's ears,feet,and tail are dark but not the warmer regions of its body core.This is an example of

A) pleiotropy.
B) environmental effects.
C) epistasis.
D) incomplete dominance.
E) co-dominance.