Which of the following is correct about genetic variation?
A)It is created by the direct action of natural selection.
B)It arises in response to changes in the environment.
C)It must be present in a population before natural selection can act upon the population.
D)It tends to be reduced when diploid organisms produce gametes and reproduce.
E)A population that has a higher average heterozygosity has less genetic variation than one with a lower average heterozygosity.

Question

Quizplus · Accepted Answer

Genetic variation must be present in a population before natural selection can act upon the population. If there is no genetic variation, there is nothing for natural selection to act on. Variation arises through genetic mutations, genetic recombination during sexual reproduction, and migration of individuals between populations. Natural selection acts on the variation that is already present in a population to favor traits that are beneficial for survival and reproduction.

Which of the Following Is Correct About Genetic Variation