Unusual reproductive incompatibility has been discovered between two strains of a nematode worm. This finding indicates that natural selection can generate long-term divergence within self-fertilizing populations.
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Phillips, P. Who shouldn't be your daddy. Nature 451, 640–641 (2008). https://doi.org/10.1038/451640a
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DOI: https://doi.org/10.1038/451640a