On This Day: DNA analysis points to African single-origin model for modern humans - July 10, 1997
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July 10, 1997: Neanderthal DNA Suggests a Separate, Unequal Being
Findings from the first DNA analysis of a Neanderthal skeleton are inconclusive, but seem to point to the accuracy of the single-origin theory, which posits that the modern human race originated from a single species in Africa.
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https://www.wired.com/2007/07/dayintech-0710/
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(edited from Wikipedia)
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In paleoanthropology, the recent African origin of modern humans is the dominant model of the geographic origin and early migration of anatomically modern humans (Homo sapiens). It follows the early expansions of hominins out of Africa, accomplished by Homo erectus and then Homo neanderthalensis.
The model proposes a "single origin" of Homo sapiens in the taxonomic sense, precluding parallel evolution in other regions of traits considered anatomically modern, but not precluding multiple admixture between H. sapiens and archaic humans in Europe and Asia. H. sapiens most likely developed in the Horn of Africa between 300,000 and 200,000 years ago, although an alternative hypothesis argues that diverse morphological features of H. sapiens appeared locally in different parts of Africa and converged due to gene flow between different populations within the same period. The "recent African origin" model proposes that all modern non-African populations are substantially descended from populations of H. sapiens that left Africa after that time.
There were at least several "out-of-Africa" dispersals of modern humans, possibly beginning as early as 270,000 years ago, including 215,000 years ago to at least Greece, and certainly via northern Africa and the Arabian Peninsula about 130,000 to 115,000 years ago.[20] There is evidence that modern humans had reached China around 80,000 years ago. Practically all of these early waves seem to have gone extinct or retreated back, and present-day humans outside Africa descend mainly from a single expansion out 70,000–50,000 years ago.
The most significant "recent" wave out of Africa took place about 70,000–50,000 years ago, via the so-called "Southern Route", spreading rapidly along the coast of Asia and reaching Australia by around 65,000–50,000 years ago, (though some researchers question the earlier Australian dates and place the arrival of humans there at 50,000 years ago at earliest, while others have suggested that these first settlers of Australia may represent an older wave before the more significant out of Africa migration and thus not necessarily be ancestral to the region's later inhabitants) while Europe was populated by an early offshoot which settled the Near East and Europe less than 55,000 years ago.
In the 2010s, studies in population genetics uncovered evidence of interbreeding that occurred between H. sapiens and archaic humans in Eurasia, Oceania and Africa, indicating that modern population groups, while mostly derived from early H. sapiens, are to a lesser extent also descended from regional variants of archaic humans.
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https://en.wikipedia.org/wiki/Recent_African_origin_of_modern_humans
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On This Day: U.S. explodes 1.4 Megaton hydrogen bomb in outer space - July 9, 1962
https://www.democraticunderground.com/1016356500
On This Day: 12 American colonies send Olive Branch Petition to Great Britain - July 8, 1775
https://www.democraticunderground.com/1016356322
On This Day: Four convicted in Lincoln assassination conspiracy hanged - July 7, 1865
https://www.democraticunderground.com/1016356217
On This Day: Pasteur uses rabies vaccine on boy mauled by rabid dog - July 6, 1885https://www.democraticunderground.com/1016356089
On This Day: Frederick Douglass delivers "What to the Slave ..." speech - July 5, 1852
https://www.democraticunderground.com/1016356008
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