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? Skin color, a polygenic trait, is also determined by environmental factors. Skin color, a polygenic trait, is also determined by the sex of the individual. Skin color, a trait that demonstrates incomplete dominance, is also determined by environmental factors. Skin color, a trait that demonstrates incomplete dominance, is also determined by the sex of the individual.

Question

Biology

Cassius Finley

12 July, 15:24

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? Skin color, a polygenic trait, is also determined by environmental factors. Skin color, a polygenic trait, is also determined by the sex of the individual. Skin color, a trait that demonstrates incomplete dominance, is also determined by environmental factors. Skin color, a trait that demonstrates incomplete dominance, is also determined by the sex of the individual.

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Answers (1)

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Alice Harmon · Answer 1

The correct option is A) Skin color, a polygenic trait, is also determined by environmental factors.

Explanation:

Polygenic trait can be described as traits which are controlled by many genes. Polygenic traits can depend on environmental factors also. The different genes controlling the polygenic traits can be located near to each other or they might be present far away.

The difference between John and Pat's colour might be because John has to work indoors whereas Pat has to work outdoors. Studies have shown that environmental factors such as light from the sun play role in the complexion of a person.