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17 de may. de 2023 · A new genetic analysis of 290 people suggests that humans emerged at various times and places in Africa.
"Recent African origin", or Out of Africa II, refers to the migration of anatomically modern humans (Homo sapiens) out of Africa after their emergence at c. 300,000 to 200,000 years ago, in contrast to "Out of Africa I", which refers to the migration of archaic humans from Africa to Eurasia from before 1.8 and up to 0.5 million years ...
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A new evolutionary model, published in Nature, examines questions around human origins in Africa. It finds that at least two evolutionary branches of Homo sapiens split, but continued to mix, over hundreds of thousands of years.
The model suggests the earliest detectable population split among early humans occurred 120,000 to 135,000 years ago, following prolonged mixing between two or more weakly genetically differentiated Homo populations.
This weakly structured stem contributed to the formation of an ancestral African human group, which then branched into contemporary African populations, as well as populations outside Africa.
Marlo Möller, co-author and professor in the Division of Molecular Biology and Human Genetics at Stellenbosch University (SU), South Africa, says that “to explain our genetic diversity, some scientists have suggested that early Homo sapiens mated with an undiscovered species. Our models include reticulation and migration between early human populations, rather than archaic hominin admixture from long-isolated branches”. Möller and SU’s Eileen Hoal, in collaboration with Brenna Henn, a population geneticist from the University of California, Davis, evolution geneticist, Aaron Ragsdale, and colleagues from the University of Wisconsin-Madison, sequenced the genome of 44 modern Nama people from an indigenous southern African population, known to carry exceptional levels of genetic diversity compared with other modern groups.
The team then tested a range of competing models of evolution and migration across Africa proposed in paleoanthropological and genetics literature, incorporating population genome data from southern, eastern, and western Africa.
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28 de oct. de 2019 · Anatomically modern humans originated in Africa around 200 thousand years ago (ka) 1, 2, 3, 4. Although some of the oldest skeletal remains suggest an eastern African origin 2, southern...
- Eva K. F. Chan, Eva K. F. Chan, Axel Timmermann, Benedetta F. Baldi, Andy E. Moore, Ruth J. Lyons, S...
- 2019
10 de feb. de 2021 · The fossil record of modern human origins in Africa. For the period from around 150 to 300 ka, African fossil crania show great morphological diversity (Fig. 2b).
- Anders Bergström, Chris Stringer, Mateja Hajdinjak, Eleanor M. L. Scerri, Eleanor M. L. Scerri, Elea...
- 2021
19 de dic. de 2023 · Fossil, genetic, archaeological, and biogeographical lines of evidence are consistent for the African origin of modern Homo sapiens and associated Middle Stone Age (MSA) technologies around 300,000 years ago.
11 de jul. de 2018 · There is a decades-old origin story for our species, in which we descended from a group of hominids who lived somewhere in Africa around 200,000 years ago. Some scientists have placed that origin...
