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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 Answer

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Skin color, a polygenic trait, is also determined by environmental factors.
User Ahmed Niri
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