Which of the following statements is true about human skin color quizlet?

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Terms in this set (4)

Which of the following statements apply to the variation in human skin color?

a) The color of human skin and the skin of our closest primate relative exhibits a similar range in variability.
b) Human skin color variation is primarily determined by the type and amount of melanin pigment in the skin.
c) Variability in human skin color can be explained by the activity of a single gene.
d) Human skin color variation likely evolved in response to differences in the intensity of sunlight around the world.
e) Human skin color variation evolved recently in hominid evolution, once some populations of our human ancestors migrated out of Africa.

b, d, e

Which of the following statements accurately describes melanin's function?

a) The more melanin an individual has in his or her skin cells, the more likely he or she is to get mutations in DNA.
b) Everyone has the same type of melanin, but the amount varies from person to person.
c) Melanin is a molecule that distinguishes humans from their primate relatives.
d) Lighter skin has less of the dark-brown eumelanin that protects cells from UV damage.

d

When a dominant allele coexists with a recessive allele in a heterozygote individual, how do they interact with each other?

a) The dominant allele prevents expression of the recessive allele by an unknown mechanism.
b) They do not interact at all.
c) The dominant allele prevents transcription of the recessive allele.

b

Select the correct explanation for the fact that a carrier of a recessive genetic disorder does not have the disorder.

a) The dominant allele for the gene determining the disorder represses protein production from the recessive allele.
b) Affected individuals have recessive mutations, but a carrier has a dominant mutation.
c) In a recessive disorder, only a single functioning allele is necessary to determine a normal phenotype.

c

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