Three genes A, B and C are involved in determination of skin colour. If a couple with fair skin colour, produced a child with dark skin colour, then the genotype of the parents most probably can be: - A. Aabbcc x aaBbcc B. AAbbcc x aabbcc C. Aabbcc x aaBBcc D. AaBbcc x aaBbCc
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The skin color is determined by three genes A, B, and C. Each gene has two alleles, and the presence of the dominant allele (A, B, or C) contributes to darker skin color. The absence (or presence of the recessive allele, a, b, or c) contributes to fairer skin Show more…
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Skin color in humans is determined by a polygenic inheritance system, possibly involving as many as 9 genes. For simplicity, let's consider the influence of 3 genes: A, B, and C, where the dominant allele darkens skin color. Suppose a woman 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 parent. b) Draw a Punnett square that shows the possible genotypes, and number each genotype from lightest (1) to darkest skin coloration. c) What are all the possibilities of the genotypes and phenotypes?
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