Speciation by reinforcement.

@article{Butlin1987SpeciationBR,
  title={Speciation by reinforcement.},
  author={Roger K Butlin},
  journal={Trends in ecology & evolution},
  year={1987},
  volume={2 1},
  pages={8-13}
}
Speciation has a central place in evolution, linking genetic processes within populations to the generation of biological diversity. The formation of new species must involve the evolution of barriers to gene flow within existing species, but how these barriers arise remains a problem. In the case of prezygotic isolation it is possible that natural selection directly favours characters that decrease gene flow. Where two populations have diverged to such an extent that they produce unfit hybrids… CONTINUE READING

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