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- W1595951622 abstract "The origins of modern human diversity have long been debated within a framework set by two hypotheses: ‘Out-of-Africa’ versus multiregional evolution. Humans are genetically closer to each other than members of all other primate species, most of our genetic diversity is accounted for by individual differences within populations, and only a small fraction of the species' genetic variance represents differences among populations or geographic groups. All these findings are hard to reconcile with the notion of parallel evolution in different continents, implicit in the multiregional model; the alternative hypotheses are now better described as either complete replacement of archaic human populations, or as partial assimilation into anatomically modern populations. Critical information about human demographic history has emerged from analyses of genomic diversity, clearly supporting an African origin of our species, followed by dispersal of rather small groups of people in the other continents. However, ancient deoxyribonucleic acid from fossil specimens seems to suggest low, but significant, levels of hybridisation between anatomically archaic and modern humans in the course of the latter's expansion from Africa, although alternative explanations of the data cannot be ruled out. Key Concepts: Genetic differences between humans are smaller than in any other primate species. Genetic differences between human populations account for a minor fraction of the species' diversity. Most human polymorphic alleles are present in all continents. Each population contains an ample subset of human allelic variants. African populations show the highest genome diversity worldwide, and alleles in other continents can largely be regarded as subsets of African diversity. Differences between populations are structured in the geographical space, showing evidence of repeated founder effects as humans expanded to colonise the whole planet. Models of genetic replacement, partial or total, of archaic human forms by anatomically modern humans account for current diversity better than any alternative models. Non-African people consistently show an excess of DNA similarity with the Neandertal genome, which is often (but not necessarily) interpreted as a consequence of archaic hybridisation between Neandertals and anatomically modern people dispersing from Africa." @default.
- W1595951622 created "2016-06-24" @default.
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- W1595951622 date "2013-10-18" @default.
- W1595951622 modified "2023-09-27" @default.
- W1595951622 title "Human Populations: Origins and Evolution" @default.
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- W1595951622 doi "https://doi.org/10.1002/9780470015902.a0001794.pub3" @default.
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