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Fernando Racimo, cheap jordans online , a population geneticist at the University of California, http://cheapjordansstock.com , Berkeley. “You could say that they’re not really completely extinct.” Some parts of the human genome don’t contain any Neandertal DNA at all, cheap retro jordans , while other parts may be 60 percent or more Neandertal (SN: 3/8/14, p. 12). Scientists have debated whether that means that evolution has favored some Neandertal genes because they benefit humans or that evolution has been slowly weeding out Neandertal DNA, cheap air jordans , and some genes have risen to prominence by chance. Early on, cheap jordans free shipping , natural selection may have played a numbers game in determining what genes would stay or go. In independent studies published online last fall at bioRxiv.org, cheap real jordans , two groups of researchers argue that dwindling Neandertal populations had built up weakly harmful mutations. Because the Neandertal populations were small and inbred, natural selection couldn’t efficiently clear out the mutations. All those small genetic disadvantages would have added up to make the average Neandertal at least 40 percent less evolutionary fit?than the average early modern human fresh from Africa, cheap jordan shoes , Nielsen and evolutionary geneticist Kelley Harris of Stanford University, cheap jordans for sale , calculate in a report published October 31. ?? When humans and Neandertals interbred, the humans’ larger population size allowed evolution to http://www.regrbl.com/...opic.php?f=4&t=181065 http://www.regards-publicite.com/ http://www.visayas.ch/gaestebuch/index.php |