A 15-Myr-old genetic bottleneck.

@article{Paape2008A1G,
  title={A 15-Myr-old genetic bottleneck.},
  author={Timothy Paape and Boris Igic and Stacey D Smith and Richard Olmstead and Lynn A. Bohs and Joshua R. Kohn},
  journal={Molecular biology and evolution},
  year={2008},
  volume={25 4},
  pages={655-63}
}
Balancing selection preserves variation at the self-incompatibility locus (S-locus) of flowering plants for tens of millions of years, making it possible to detect demographic events that occurred prior to the origin of extant species. In contrast to other Solanaceae examined, SI species in the sister genera Physalis and Witheringia share restricted variation at the S-locus. This restriction is indicative of an ancient bottleneck that occurred in a common ancestor. We sequenced 14 S-alleles… CONTINUE READING

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