The answer is "a. True".
Genetic variation is a proportion of the genetic contrasts that exist inside a population. The genetic variation of a whole species is regularly called genetic diversity.
Genetic variations are the distinctions in DNA sections or genes among people and every variety of a quality is called an allele. For example, a population with a wide range of alleles at a solitary chromosome locus has a high measure of genetic variation. Genetic variation is basic for normal choice since common choice can just increment or reduction recurrence of alleles that as of now exist in the population.