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Polygenic Inheritance Human skin color is a good example of polygenic (multiple gene) inheritance. Assume that three "dominant" capital letter genes (A, B and C) control dark pigmentation because more melanin is produced. The "recessive"alleles of these three genes (a, b & c) control light pigmentation because lower amounts of melanin are produced. (AABBCC) has the maximum amount of melanin and very dark skin. A genotype with all "recessive" small case genes (aabbcc) has the lowest amount of melanin and very light skin. AaBbCc has a medium amount of melanin and an intermediate skin color. AaBbCc x AaBbCc Each parent produces eight different types of gametes. The skin colors can be represented by the number of capital letters, ranging from zero (no capital letters) to six (all capital letters). Gametes ABC ABC ABc AbC Abc aBC aBc abC abc ABc AbC Abc aBC aBc abC abc Gametes ABC ABc AbC Abc aBC aBc abC abc ABC ABc AbC Abc aBC aBc abC abc The offspring contain seven different shades of skin color based on the number of capital letters in each genotype.