In diploid eukaryotes, this is a consequence of the system of sexual reproduction, where mutant alleles get partially shielded, for example, by the selective advantage of heterozygotes.

 
  • 在二倍体真核生物中,这是有性繁殖的结果;比如,有性繁殖时突变的等位基因被杂合子的选择性优势部分地屏蔽。
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