minoridiot: That's odd.
abb3w: Might make for an entertaining example for discussing the effects of mutations and sexual selection.If such a trait is caused by mutation, it may tend to contribute to a lower rate of conception per instance of intercourse, due to more complicated plumbing; but there may be an increase in the number of opportunities for intercourse among the venturesome young ladies of a curiousity-prone species. Depending on the net balance, the mutation may tend to fade out, become prevalent over time, or drift along neutrally. Additional factors in the spread include whether it's a dominant or recessive mutation, what other effects on survival (such as increased tendency to UTIs) may result, and the degree of certainty that a gene leads to such a trait.Of course, it appears in actuality to simply be an environmental epigenetic or teratogenic "defect", not passed between generations. Might still get the college students in intro bio to stop sleeping through class... though probably with too much giggle factor to be of much use.
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