tag:blogger.com,1999:blog-7785493.post6204783441643010845..comments2024-01-04T04:11:55.717+02:00Comments on Dienekes’ Anthropology Blog: Out of South Africa? Out of anywhere?Dienekeshttp://www.blogger.com/profile/02082684850093948970noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-7785493.post-34880673963578250452011-03-11T05:50:42.277+02:002011-03-11T05:50:42.277+02:00"Rather, it proposes that modern humans (Homo..."Rather, it proposes that modern humans (Homo sapiens) are genomic blends of components that originated at different times in different places: there was never an 'African tribe on the verge of extinction that went on to populate the world', but a single set of interbreeding Homo populations where alleles could (and did) originate anywhere" <br /><br />Exactly. Couldn't agree more. <br /><br />"What is the underlying assumption causing so many divergent opinions?" <br /><br />It derives from the elitist attitudes that have underlain evolutionary theory since its inception. People feel a need to interpret the evidence as showing that some small group, 'superior' in some way, has replaced 'inferior' species. This in spite of the fact that if evolution proceeded in that fashion inbreeding would be a huge problem in every newly-evolved species. The fact seems to be that species do change, perhaps not 'slowly, imperceptibly', but certainly they change as genes evolve and spread through the species. Some spread widely through the species' whole geographic range. Other genes have a more limited spread. Hence we have regional 'subspecies'. One of my friends calls this 'the wave theory of evolution'. <br /><br />'a population's diversity does not increase only when it is ancient, but also when it is admixed, the product of the coming together of two genetically divergent populations". <br /><br />True. And that is why Y-hap c appears very diverse in India, and why Y-hap O appears very diverse in SE Asia. <br /><br />"African hunter-gatherers are to a large extent the product of old admixture between 'modern' humans and archaic Africans, just as Eurasians may also be the product old admixture between 'modern' humans and archaic Eurasians, such as the Neandertals or Denisovans". <br /><br />I very much agree.terrythttps://www.blogger.com/profile/17327062321100035888noreply@blogger.comtag:blogger.com,1999:blog-7785493.post-56453681089454493042011-03-10T15:27:59.602+02:002011-03-10T15:27:59.602+02:00The admixed status of Mexicans can be inferred bec...The admixed status of Mexicans can be inferred because there still exist in unadmixed form the constituent elements that led to their formation, and the admixture event took place recently enough for entire blocks of DNA to be inherited in them from definite continental sources.<br /><br />The case of Africans is quite interesting in that respect. If the Bushmen hadn't been discovered for a thousand years more, chances are they would've been totally assimilated by the Bantu and it would've been impossible to infer their very existence, unless one dug up some of their bones, DNA tested them, and noticed that a few modern humans resemble them more.<br /><br />In all likelihood, the farming dispersal in Africa, as well as the spread of modern humans much earlier led to the assimilation of numerous tribes of "Palaeoafricans" whose diversity cannot be measured, because they no longer exist as distinct people. The fact that the Bushmen have the highest genetic diversity does not mean that modern humans originated there: the (more? less?) diverse DNA of other Palaeoafrican tribes assimilated by farmers/pastoralists emanating from different parts of Africa simple no longer exists in a distinct people, but only as assimilated bits in the demographically dominant (and genetically homogeneous) gene pool of the dominant groups.Dienekeshttps://www.blogger.com/profile/02082684850093948970noreply@blogger.comtag:blogger.com,1999:blog-7785493.post-43127915090051967602011-03-09T16:31:35.664+02:002011-03-09T16:31:35.664+02:00"It is interesting to see the small Tuscan co..."It is interesting to see the small Tuscan component (orange color) scattered throughout some of the African samples. I wonder if that can be associated with E1b1b(1)M215/ M35?"<br /><br />In the case of the South African San samples, it is certainly due to the European colonization and recent European admixture, as is also clear from the MDS results of the South African San samples and the Admixture and MDS results of the Namibian San samples, who all clearly lack European admixture.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7785493.post-86253068365371121952011-03-09T03:51:51.866+02:002011-03-09T03:51:51.866+02:00It is interesting to see the small Tuscan componen...It is interesting to see the small Tuscan component (orange color) scattered throughout some of the African samples. I wonder if that can be associated with E1b1b(1)M215/ M35?<br /><br />The seeming Bantu component (rusty red color) is not surprising...<br /><br />The small, but interesting San component (sky blue color) in the Biaka Pygmy, Mandenka, and Yoruba...What do you make of that, Dienekes? The others with that very small component are not too surprising because of contacts with click-speaking populations. The Yoruba, Mandenka, and Biaka Pygmies are different because of location, well away from click-speaking populations.<br /><br />The tiny Maasai component (yellow and pink colors) in the Mandenka and Yoruba...interesting also. Same with the Hadza and Sandawe component in those two populations...The yellow and pink color seem to be most strongly assocoated with Nilo-Saharan speakers (the Maasai).<br /><br />There seems to have been a small amount of gene flow from East to West???AdygheChabadihttps://www.blogger.com/profile/02303595735003236434noreply@blogger.comtag:blogger.com,1999:blog-7785493.post-2651058176330404652011-03-09T01:00:15.640+02:002011-03-09T01:00:15.640+02:00Regarding the genetic diversity of the San people,...Regarding the genetic diversity of the San people, it is worth mentioning that their highly divergent Y-DNA and mtDNA suggests that they did branch off from the ancestors of most other human groups pretty early on, and this would also explain their greater diversity.Lankhttps://www.blogger.com/profile/09164328821211694856noreply@blogger.com