New versions of a gene can also become universal in a population through a random process known as genetic drift.
当人体经过遗传漂变的过程后，基因变种在人类中变得更常见。
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Genetic variation is major study content in conservation genetics. In small population, genetic variation loss because of bottleneck effect, inbreeding, founder effect, and genetic drift.
This study results indicated that high level genetic variation was still in Red mirror carp population, but genetic drift and artificial se- lection had much effect on population.