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Max Planck, Harvard and Sao Paulo researchers deny their DNA models are suspect
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[QUOTE]Originally posted by Tyrannohotep: [QB] [QUOTE]Originally posted by Djehuti: [qb] By the way, despite all the wishful thoughts and/or fusses about what early Lagoa Santa people looked like I'm still waiting for studies refuting the findings of Neves et al. such as this one from 1999: [URL=http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571999000400001]LAPA VERMELHA IV HOMINID 1: MORPHOLOGICAL AFFINITIES OF THE EARLIEST KNOWN AMERICAN[/URL] [i] All this information indicates that the Americas were first occupied by a generalized population of Homo sapiens very similar to the one that departed from East Asia to Australia around 50,000 B.P., and whose remote origins ultimately can be traced back to Africa (Lahr, 1995; Munford et al., 1995; Neves et al., 1997). This morphology is primarily characterized by very long and narrow skulls, short and narrow faces, with short orbits and noses. A process of in situ microevolution leading to mongolization cannot be ruled out to explain what is seen in terms of cranial morphology in later native American populations, namely broad faces and vaults, tall faces with tall orbits and noses. As Lahr (1995) emphasized, this would have implicated a tremendous amount of convergent evolution in Asia and in the Americas. [b]This becomes even more difficult to accept if we recall that Sutter (1997) has suggested that dental morphology has also changed from a sundadont to a sinodont pattern in prehistoric coastal Chile and Peru during the Middle Holocene. Another indicator that weakens the local microevolution argument is that, at least in South America, the evidence seems to point to a major population replacement around 8,000 to 9,000 years B.P., when the generalized morphology was abruptly replaced by the classic Mongoloid morphology[/b] (Munford et al., 1995; Neves et al., 1996a).[/i] By the way, here is a 2005 study from Richard Sutter reaffirming his prior findings: [URL=https://pdfs.semanticscholar.org/24ba/1a1ca02fdc52b6841deec08791cb170a5517.pdf]The Prehistoric Peopling of South America as Inferred from Epigenetic Dental Traits[/URL] You add up the sundadonty dental morphology along with the cranial morphology [i]and[/i] the Population Y genetics, and it's too much to evidence think there was one homogenous population from Beringia that settled the Americas. [/qb][/QUOTE]For what it's worth, [URL=https://www.eurekalert.org/pub_releases/2018-11/fda-tnf110918.php]the EurekAlert article[/URL] mentions that Luzia's people could represent a separate (even if related) wave from the ancestors of modern Native South Americans. [QUOTE]"From the genetic standpoint, the Lagoa Santa people are descendants of the first Amerindians," said archeologist André Menezes Strauss, who coordinated the Brazilian part of the study. Strauss is affiliated with the University of São Paulo's Museum of Archeology and Ethnology (MAE-USP). [qb]"Surprisingly, the members of this first lineage of South Americans left no identifiable descendants among today's Amerindians," he said. "Some 9,000 years ago their DNA disappears completely from the fossil samples and is replaced by DNA from the first migratory wave, prior to the Clovis culture. All living Amerindians are descendants of this first wave. We don't yet know why the genetic stock of the Lagoa Santa people disappeared."[/qb] One possible reason for the disappearance of DNA from the second migration is that it was diluted in the DNA of the Amerindians who are descendants of the first wave and cannot be identified by existing methods of genetic analysis.[/QUOTE]That might account for Luzia's people not looking quite the same physically (e.g. their less "Sinodont" features) as extant Natives in the region. [/QB][/QUOTE]
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