This photo displays a difference in eye color. One eye has a dominant color, brown, and the other has a recessive color, blue. Eye color is an example of a dominant vs. recessive phenotype. Dominant vs. recessive refer to the genotypic interaction of alleles in producing the phenotype of the heterozygote. The key concept is genetic: which of the two alleles is present in the heterozygote is expressed, such that the organism is phenotypically identical to one of the two homozygotes.
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