这个词是什么意思？
A phenomenon that is observed when a small subgroup of a larger POPULATION establishes itself as a separate and isolated entity. The subgroup's GENE POOL carries only a fraction of the genetic diversity of the parental population resulting in an increased frequency of certain diseases in the subgroup, especially those diseases known to be autosomal recessive.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D018703 · MeSH 2026。
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