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- W2413820909 abstract "There have been conflicting arguments as to what happened in the human‐chimpanzee speciation event. Patterson et al. (2006, Geneticevidenceforcomplex speciationof humans and chimpanzees.Nature 441:1103‐1108) proposedahypothesis that the human‐chimpanzee speciation event involved a complicated demographic process: that is, the ancestral lineages of humans and chimpanzees experienced temporal isolation followed by a hybridization event. This hypothesis stemmed from twomajor observations:a wide range of human‐chimpanzeenucleotidedivergence across the autosomal genome and very lowdivergence in the X chromosome. In contrast, Innanand Watanabe(2006, The effectof geneflow on the coalescent time in the human-chimpanzee ancestral population. Mol Biol Evol. 23:1040‐1047) demonstrated that the null model of instantaneousspeciationfits the genome-wide divergence data for the two speciesbetter than alternativemodels involving partialisolationandmigration. To reconcilethesetwoconflictingreports,wefirst reexaminedthe analysisof autosomaldata by Patterson et al. (2006). By providing a theoretical framework for their analysis, we demonstrated that their observation is whatistheoreticallyexpectedunderthenullmodelofinstantaneousspeciationwithalargeancestralpopulation.Ouranalysis indicatedthattheobserved widerangeof autosomaldivergence issimplydue tothe coalescentprocessin thelargeancestral population of the two species. To further verify this, we developed a maximum likelihood function to detect evidence of hybridization in genome-wide divergence data. Again, the null model with no hybridization best fits the data. We conclude that the simplestspeciation model with instantaneoussplit adequately describes the human‐chimpanzee speciation event, and there isno strong reason to involvecomplicated factorsin explainingthe autosomal data." @default.
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- W2413820909 date "2012-01-01" @default.
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- W2413820909 title "AnAutosomalAnalysisGivesNoGeneticEvidence forComplex Speciation of Humans and Chimpanzees" @default.
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