In a population, allele S is strongly favored. However, over time, the frequency of the s allele does not significantly decrease, but rather is maintained. What evolutionary process(es) could be responsible for countering the effect of selection for the S allele? (Select all that apply.)A) mutationB) genetic driftC) gene flowD) assortative mating
What will be an ideal response?
A, B, C
In theory, mutation and genetic drift can counter the effects of selection. However, mutation rates are rarely high enough to counter the effects of natural selection and natural selection is expected to overwhelm drift except when populations are very small. Gene flow can serve to counter or enhance natural selection.
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