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Not all pairs of alleles will have the same phenotype: dominance when AA = Aa in phenotype, A is dominant, a is recessive. An allele can be dominant over one allele but recessive to another allele.
1. Polygenic traits are determined by more than one gene, with each gene providing a small, but additive effect. 2. Multifactorial traits are determined by interactions between a gene or genes and the environment, and do not exhibit Mendelian ratios.. Differences in skin color arise from the quantity and distribution of the pigment melanin in the uppermost layers of skin cells. 2. Exposure to sunlight is an environmental factor that can affect skin color. 3. From a genetic perspective, allele frequencies are the best indicator of shared heritage in a population.