Brett Aubrey  wrote or quoted:

> In Richard Dawkin's The Ancestor's Tale, he mentions the 50/50 split on
> Humanity's ability to curl our tongue into a tube.  Might there have been a
> reason for this trait, or its' absense?  Or is this just likely an example
> of a minor mutation that is advantageously neutral?  Or something else?  TIA

http://www.discovery.com/area/skinnyon/skinnyon970226/skinny1.html

....claims there's not much evidence that the trait is genetic at all:

``In 1983 a Hungarian named Forrai found no genetic basis for 
  tongue-curling - or hand-clasping or arm-folding. And studying the
  Greeks of Thessaloniki in 1982, Cruz-Gonzalez established that while 
  dry ear wax and attached ear lobes are recessive traits, which means 
  you need the gene from both your parents, the genetic basis for 
  tongue-rolling was less clear.''
-- 
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