Which statement best describes the relationship between an allele’s frequency and its dominance?

Dominance describes how an allele affects the observable trait in a heterozygous individual; frequency describes how common that allele is in a population. These are different properties, and a dominant allele is not necessarily common. Allele frequencies can be influenced by factors such as natural selection and genetic drift, so “Frequency results from environmental stresses, not dominance” is the best choice.

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