In some instances environmental change causes a situation where one phenotype is favored for a period of time, and then a different phenotype is favored. This oscillating selection causes
A. the maintenance of genetic variation in the population.
B. an increase in point mutations.
C. elimination of rarer genotypes because of uneven selection.
D. extinction of the population.
E. high population increase to maintain phenotypic variation.
A. the maintenance of genetic variation in the population.
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