Postprint version. Published in Cell, Volume 106, Issue 6, September 21, 2001, pages 647-650.
NOTE: At the time of publication, the author Kenneth Hillers was not yet affiliated with Cal Poly.
The definitive version is available at https://doi.org/10.1016/S0092-8674(01)00500-1.
Sexual reproduction predominates among eukaryotic organisms on our planet. While debate continues over why this should be so, burgeoning genomic and functional information now allows us to begin to think reasonably about some of the events that may have occurred to make sex possible in the first place.