Human skin color is darkest in indigenous populations (native, or people originating from) living

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Collen VonLv2

27 Aug 2018

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Suppose that there are three genes (called A, B, and C) that influence human skin color. (In reality, there are many more genes that affect skin color!) For each of these three genes, a dominant allele (represented by a capital letter) increases the amount of pigment production by a fixed amount. All dominant alleles have an equal effect on the phenotype. Put these genotypes in order with respect to the phenotype they produce, from lightest skin color (least pigment) to darkest skin color (most pigment).

Skin color in humans is determined by a polygenic inheritance system, possibly involving involving as many as 9 genes. For simplicity letâs consider the influence of 3 genes: A, B, and C, where the dominant allele darkens skin color. Suppose a women who is AABbCc mates with a man who is AaBbcc.

a) List all of the possible genotypes of the gametes that could be produced by each the parents?

b) Draw a Punnett square that shows the genotypes possible, and number each genotype from lightest (1) to darkest skin coloration.

c) What are all the posibilities of the genotypes and phenotypes?

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a. In your words, briefly describe the biology of skin color. Use the following terms appropriately in your explanation of why human have a beautiful range of skin color tones across the globe: UV light, natural selection, human migration, melanin, skin cancer, folate and Vitamin D.

b. why sometimes there is a mismatch between your skin tone and your current geographic/latitudinal location discuss possible solution. Don't forget to consider modern behaviors, e.g. are you inside all day?

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Human skin color is darkest in indigenous populations (native, or people originating from) living

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