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. extinction of the population.
B. an increase in point mutations.
C. the maintenance of genetic variation in the population.
D. high population increase to maintain phenotypic variation.
E. elimination of rarer genotypes because of uneven selection.
Answer: C
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