The Punnett square illustrates a cross for color of the flower. Based on the phenotypes and genotypes of these offspring. It is clear that purple flower color allele is
and the parents are
dominant
polygenetic
recessive
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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.

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