A glacier could thrust across their range, for example.The isolated population evolves new genes, and some of those new genes may make interbreeding difficult or impossible.

 
  • 举例来说,冰河可以分割物种的分布范围,受到隔离的族群会演化出新的基因,而其中一些新的基因可能导致不同族群间不易或完全无法交配。
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