Human evolution: Difference between revisions

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m Fix broken anchor: 2017-09-05 (VERY DIFFERENT 17≥6) #Fossil record→Fossil#Dating
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* {{cite web |url=http://www.timetree.org/index.php?taxon_a=Hominidae&taxon_b=Hylobatidae&submit=Search |title=Find Time of Divergence: Hominidae versus Hylobatidae |website=[[TimeTree]] |access-date=April 18, 2015}}</ref><ref>{{cite journal |last=Ruvolo |first=Maryellen |date=October 1997 |title=Genetic Diversity in Hominoid Primates |journal=Annual Review of Anthropology |volume=26 |pages=515–540 |doi=10.1146/annurev.anthro.26.1.515 |issn=0084-6570}}</ref><ref name=Ruvolo1997>{{cite journal |last=Ruvolo |first=Maryellen |date=March 1997 |title=Molecular Phylogeny of the Hominoids: Inferences from Multiple Independent DNA Sequence Data Sets |journal=Molecular Biology and Evolution |volume=14 |issue=3 |pages=248–265 |doi=10.1093/oxfordjournals.molbev.a025761 |issn=0737-4038 |pmid=9066793|doi-access=free }}</ref> [[Speciation]], however, appears to have been unusually drawn out. Initial divergence occurred sometime between {{Mya|7|13}}, but ongoing hybridization blurred the separation and delayed complete separation during several millions of years. Patterson (2006) dated the final divergence at {{Mya|5|6}}.<ref>{{cite journal | last1 = Patterson | first1 = N | last2 = Richter | first2 = DJ | last3 = Gnerre | first3 = S | last4 = Lander | first4 = ES | last5 = Reich | first5 = D | year = 2006 | title = Genetic evidence for complex speciation of humans and chimpanzees | journal = Nature | volume = 441 | issue = 7097| pages = 1103–1108 | doi = 10.1038/nature04789 | pmid = 16710306 | bibcode = 2006Natur.441.1103P | s2cid = 2325560 }}</ref>
 
Genetic evidence has also been employed to resolve the question of whether there was any [[Archaic human admixture with modern humans|gene flow between early modern humans and Neanderthals]], and to enhance ourthe understanding of the early human migration patterns and splitting dates. By comparing the parts of the genome that are not under natural selection and which therefore accumulate mutations at a fairly steady rate, it is possible to reconstruct a genetic tree incorporating the entire human species since the last shared ancestor.
 
Each time a certain mutation ([[single-nucleotide polymorphism]]) appears in an individual and is passed on to his or her descendants, a haplogroup is formed including all of the descendants of the individual who will also carry that mutation. By comparing mitochondrial [[DNA]] which is inherited only from the mother, geneticists have concluded that the last female common ancestor whose [[genetic marker]] is found in all modern humans, the so-called [[mitochondrial Eve]], must have lived around 200,000 years ago.
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