We can draw two larger points from all of this. First, if amonggroup
trait variation is substantially the result of genetic variation
in groups, then human populations are not ‘natural experiments’
(Auerbach, 2007; King, 2010), as their entangled prehistories
render them non-independent from one another. Bouts of selection
in ancestral populations, along with the cumulative effects of
random genetic drift and gene flow, will all shape the variation
among groups. Perhaps more importantly, however, is the reinforcement
of the notion that among-group human phenotypic
variation is shaped by multiple environmental and evolutionary
forces.
We can draw two larger points from all of this. First, if amonggrouptrait variation is substantially the result of genetic variationin groups, then human populations are not ‘natural experiments’(Auerbach, 2007; King, 2010), as their entangled prehistoriesrender them non-independent from one another. Bouts of selectionin ancestral populations, along with the cumulative effects ofrandom genetic drift and gene flow, will all shape the variationamong groups. Perhaps more importantly, however, is the reinforcementof the notion that among-group human phenotypicvariation is shaped by multiple environmental and evolutionaryforces.
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