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

Lucia Knight

Biology

16 August, 09:58

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.

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Answers (2)

Know the Answer?

Katz · Answer 1

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.

Zion Ritter · Answer 2

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