In the sex lives of male worms in the lab, one gene makes a big difference

For tiny nematode worms of the species Caenorhabditis elegans -- males are rare and all but irrelevant in nature. That's because the vast majority of C. elegans individuals are self-fertilizing hermaphrodites. In the laboratory environment, males of the species do turn up with some regularity, and now researchers have discovered natural variation in a single gene produces males with excretory pores that attract the sexual attentions of other males.

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