Caenorhabditis elegans primarily reproduces as a hermaphrodite. Independent gene conversion events in mutant obligately outcrossing populations of C. elegans [fog-2(lf)] spontaneously repaired the loss-of-function mutation in the fog-2 locus, thereby reestablishing hermaphroditism as the primary means of reproduction for the populations.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2535716PMC
http://dx.doi.org/10.1534/genetics.108.090035DOI Listing

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