Source: University of Chicago Medical Center Date: April 22, 2007 Chimpanzees Are Actually Three Distinct Groups, Gene Study Shows Science Daily — The largest study to date of genetic variation among chimpanzees has found that the traditional, geography-based sorting of chimps into three populations--western, central and eastern--is underpinned by significant genetic differences, two to three times greater than the variation between the most different human populations. In the April 2007 issue of the journal PLOS Genetics, researchers from the University of Chicago, Harvard, the Broad Institute and Arizona State show that there has been very little detectable admixture between the...