John and Pat are identical twins with identical DNA. John works in a movie theater, and Pat works as a lifeguard. They have very different skin pigmentation. Which is the best explanation of the difference?

A. Skin color, a polygenic trait, is also determined by environmental factors.

B. Skin color, a polygenic trait, is also determined by the sex of the individual.

C. Skin color, a trait that demonstrates incomplete dominance, is also determined by environmental factors.

D. Skin color, a trait that demonstrates incomplete dominance, is also determined by the sex of the individual.

Question

Biology

Marilyn Russell

20 May, 18:34

John and Pat are identical twins with identical DNA. John works in a movie theater, and Pat works as a lifeguard. They have very different skin pigmentation. Which is the best explanation of the difference?

A. Skin color, a polygenic trait, is also determined by environmental factors.

B. Skin color, a polygenic trait, is also determined by the sex of the individual.

C. Skin color, a trait that demonstrates incomplete dominance, is also determined by environmental factors.

D. Skin color, a trait that demonstrates incomplete dominance, is also determined by the sex of the individual.

+1

Answers (2)

Know the Answer?

Tristan Hebert · Answer 1

A. Skin color, a polygenic trait, is also determined by environmental factors.

Iliana · Answer 2

It isn't B or D because identical twins have identical DNA, so they have to be the same gender. Skin color is a polygenic trait (meaning it is controlled by multiple genes) and it is also controlled by environmental factors such as UV light from the sun so it is A.