原因可能包括遗传选取、集体混杂、基因漂变(gene drift)及新的基因渐变等。这种由混杂、选取或漂变所致的非连锁位点间的不均衡将随时间推移很快消灭，而慎密连锁位点间的不均衡随时间推...
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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。
And gene flows of 4 populations were over 2, which suggested that there existed sufficient genetic exchanges to prevent the genetic differentiation made by genetic drift among population.
并且4个居群的基因流值都大于2，说明基因交流防止了由遗传漂变引起的居群间的遗传分化。
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