Which statement is NOT true about the maintenance of variation in a
population?
O Heterozygote superiority may lead to selection for the heterozygote above
either homozygote.
O Selection for adaptation to a particular environment ensures that the
population will become stronger and more viable under any conditions.
O Only phenotypes are acted on by selection, so heterozygotes serve as a
reservoir of recessive alleles that may be adaptive in a different environment.
O Variations allow for the presence of conditions such as sickle cell anemia.
O Variation is maintained through mutation, recombination, gene flow, and
changed conditions.