10.3  Gene Pools and Speciation

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Essential Idea:

Gene pools change over time


  • A gene pool consists of all the genes and their different alleles, present in an interbreeding population
  • Evolution requires that allele frequencies change with time in populations
  • Reproductive isolation of populations can be temporal, behavioural or geographic
  • Speciation due to divergence of isolated populations can be gradual
  • Speciation can occur abruptly


  • Identifying examples of directional, stabilising and disruptive selection
  • Speciation in the genus Allium by polyploidy


  • Comparison of allele frequencies of geographically isolated populations