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ScienceDaily (2009-06-07) -- New research indicates that natural selection may shape the human genome much more slowly than previously thought. Other factors -- the movements of humans within and among continents, the expansions and contractions of populations, and the vagaries of genetic chance -- have heavily influenced the distribution of genetic variations in populations around the world.
References:
Public Library of Science (2009, June 7). Geography And History Shape Genetic Differences In Humans. ScienceDaily. Retrieved June 7, 2009, from http://www.sciencedaily.com/releases/2009/06/090605091157.htm#
