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If it is a point (or other relatively simple) mutation, it could have arisen independently in several places and at several times at once. Also, what askod said about genetic drift of non-selected alleles.

(Which is not to say that there wasn't substantial consanguinity in pairings in pre- and early modern societies - there must have been, if only due to the geographic isolation of sedentary societies with poor transportation infrastructure.

- Jake

Friends come and go. Enemies accumulate.

by JakeS (JangoSierra 'at' gmail 'dot' com) on Thu Nov 8th, 2012 at 04:37:05 PM EST
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