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www.reference.com/article/genetic-variation-fd74214c2b736c93

Genetic variation generally refers to the differences in genes between individual members of a population, or the frequency in which the various gene types are expressed. Genetic variation is incredibly important for the survival and adaptation of a species, as it helps...

www.reference.com/science/causes-genetic-variation-7a8bc86774e1ec1d

Genetic variation is the result of mutation, gene flow between populations and sexual reproduction. In asexually reproducing organisms, some genetic variation may still result from random mutation.

www.reference.com/article/two-main-sources-genetic-variation-4d064a23859c0e2a

The two main sources of genetic variation are mutations and recombinations of genes as a result of sexual reproduction. A mutation is a permanent change in the DNA within a gene.

www.reference.com/science/genetic-variation-important-670d90b1826491ee

Genetic variation is important because a population has a better chance of surviving and flourishing than a population with limited genetic variation. Genetic diversity also decreases the occurrence of unfavorable inherited traits.

www.reference.com/world-view/crossing-over-create-genetic-variation-95505f7acf2d3983

Crossing over creates genetic variation by exchanging DNA between two nonsister chromatids to produce genetically unique chromosomes. The process of crossing over occurs during meiosis.

www.reference.com/article/genetic-variation-important-evolution-50cbb33e647471e3

Genetic variation is important to evolution because it helps to maintain the health of a population by constituting alleles that may be useful in overcoming stresses such as diseases and pests. Without genetic variation, some of the fundamental mechanisms of evolutionar...

www.reference.com/article/type-selection-tends-increase-genetic-variation-e749821e82555bc1

Disruptive selection tends to increase genetic variation in populations, according to About.com. It is the opposite of stabilizing selection, which tends to drive a population toward a mean genotype and eliminate outliers on either end of the population average.