why skin comes in colors

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Arthur M


Date added:

February 13, 2013








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Each gene has two forms: dark-skin allele (A, B, and C) and light-skin allele (a, b, and c). Neither allele is completely dominant to the other, and heterozygotes exhibit an intermediate phenotype (incomplete dominance). Each dark-skin allele in the genotype adds pigment by increasing melanin production...
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There are seven different shades of skin color ranging from very light (aabbcc) to very dark (AABBC); most individuals have the intermediate skin color (AaBbCc). A cross between two individuals with intermediate skin color produces offspring with a range of phenotypes (bell-shaped curve). According to the article, some suggest there is a linked between shades of skin color and degrees of exposure to the sun's UV rays...
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