Which of the following is a true statement concerning genetic variation? Select one: А. It must be present in a population before natural selection can act upon the population. В. It arises in response to changes in the environment. С. It tends to be reduced by the processes involved when diploid organisms produce gametes. D. It is created by the direct action of natural selection. E. A population that has a higher average heterozygosity has less genetic variation than one with a lower average heterozygosity.

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Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.