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.