The Himalayan Allele in Rabbits Produces Dark Fur at the Extremities

Multiple Choice

The himalayan allele in rabbits produces dark fur at the extremities of the body-on the nose, ears, and feet. The dark pigment develops, however, only when a rabbit is reared at a temperature of 25°C or lower; if a Himalayan rabbit is reared at 30°C, no dark patches develop. What does this exemplify?

A) dominance
B) discontinuous characteristic
C) genetic imprinting
D) phenocopy
E) temperature-sensitive allele