Genetic variation is hard to be associated with evolution because most genetic variation is neutral. It means that most genetic variation occurs in non-coding regions.
Evolution refers to descendence with modification, which is mainly due to the differential process of natural selection.
Genetic variation is a prerequisite for evolution to occur, but that variation should (ideally) be localized in protein-coding regions.
It has been proposed that genetic variation in non-coding DNA regions can not modify the phenotype: however, an increasing body of evidence is showing that this assumption is not correct.
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