posted
Smart man! That is the first thing to come to my mind. But notice the smaller curve is under/intersect the African curve. Notice also the Africa curve also has a barely visible 2nd curve.
Yes the implication is a 2nd migratory evident. I am thinking a north West Africa migration IN ADDITION to East Africa. Same stock TWO different migration path. Remember LA Brana was YDNA C ie South East Asians. Looks like the migration path(s) have been consistent since pre-Neanderthal.
Thoughts anyone. Critique?
-------------------- Without data you are just another person with an opinion - Deming Posts: 12143 | From: When you have eliminated the impossible, whatever remains, however improbable | Registered: Jun 2007
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Tukuler
multidisciplinary Black Scholar
Member # 19944
posted
Glad somebody picked up on what I put down in my OP.
quote:Originally posted by Elmaestro: Given the results of Schlebusch and even gurdasani 2015 I feel it might be appropriate to revisit elder Anthropological studies, though I'm not fond of physical Anthropology, I stumbled over something while reading a very old genetics paper... Iwo Eleru.
posted
Here are a few interesting ones I pulled. Reich and Paabo are a fervent racist so know what to expect from him. West Africans are MORE archaic…….But my take away is Khoe_San inhabited regions further north…in the Zanzibar archipelago!!! That is an Island off the coast of East Africa. Did they sail to the Island? Lol! These confused white people.
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Intergrating ancient and modern DNA Reconstructing prehistoric African population structure and adaptation
Pontus Skoglund*, Svante Pääbo, David Reich
Abstract: The population genomic landscape of Africa prior to its transformation by expansions of farmers and pastoralists is poorly understood, partly due to poor ancient DNA preservation and partly due to the deep time scale of human population history on the continent. We assembled genome-wide data from ten sub-Saharan Africans who lived in the last 4,500 years, and show that one of the most deeply divergent present-day human lineages that is today found almost exclusively in people living in southern Africa, was in the past 2,000 years also present in populations much farther north in Malawi and the Zanzibar archipelago. These results highlight the existence of an ancient genetic cline stretched over thousands of kilometers along a south-north axis. By leveraging data from ancient African genomes without ancestry from more recent into-Africa migrations, we show that western Africans today may harbor ancestry from a lineage that separated from other modern human lineages earlier than any other, including the Khoe-San of southern Africa. Finally, we use the availability of time-stratified southern African genomes to document evidence of both selective sweeps and polygenic selection that might have conferred adaptations to desert environments.
Detecting introgressed loci using machine learning - Daniel Schrider*, Andrew Kern
Abstract: Speciation with gene flow appears to be common, and knowledge of which loci have and have not experienced such gene flow can elucidate the genetic basis of hybrid incompatibility. Moreover adaptive introgression, in which beneficial alleles cross species boundaries, appears to be commonplace in nature. Thus it is crucial to develop the statistical machinery required to uncover which genomic regions have recently acquired haplotypes via introgression from a sister species. We developed a novel machine learning framework, called FILET (Finding Introgressed Loci via Extra-Trees). It has been suggested that some sub-Saharan African populations contain DNA whose ancestry traces back to an unknown archaic hominin [5]. Our analyses reveals numerous loci that show strong signatures of recent introgression (within 100 kya) from a population that diverged from modern humans >500 kya. This result implies that the extent to which modern humans SHARE ancestry with archaic hominin relatives is even greater than has been suggested by comparisons with ancient DNA samples.
-------------------- Without data you are just another person with an opinion - Deming Posts: 12143 | From: When you have eliminated the impossible, whatever remains, however improbable | Registered: Jun 2007
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Tukuler
multidisciplinary Black Scholar
Member # 19944
posted
You can't seem to comment without your racial hatred interfering. If you can't contribute without interjecting your opinions of white people and n homosexuals Do me a favor stfu and go away. Please.
-------------------- Without data you are just another person with an opinion - Deming Posts: 12143 | From: When you have eliminated the impossible, whatever remains, however improbable | Registered: Jun 2007
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Tukuler
multidisciplinary Black Scholar
Member # 19944
posted
C'mon fam.
Don't be like that.
We want you to go to the Bains Douches with us.
But you got to behave and get along You gotta treat and speak of and to people The way you want them to treat and speak to you
It ain't that hard (says an ill-tempered he-trout like me)
Tukuler
multidisciplinary Black Scholar
Member # 19944
posted
Recovering signals of ghost archaic admixture in the genomes of present-day Africans Arun Durvasula, Sriram Sankararaman doi: https://doi.org/10.1101/285734
This article is a preprint and has not been peer-reviewed.
Abstract
Analyses of Neanderthal and Denisovan genomes have characterized multiple interbreeding events between archaic and modern human populations. While several studies have suggested the presence of deeply diverged lineages in present-day African populations, we lack methods to precisely characterize these introgression events without access to reference archaic genomes.
We find several loci that harbor archaic ancestry at elevated frequencies and that the archaic ancestry in the Yoruba is reduced near selectively constrained regions of the genome suggesting that archaic admixture has had a systematic impact on the fitness of modern human populations both within and outside of Africa.
Using our inferred segments of archaic ancestry in the Yoruba, we find that there are regions of the genome that are under higher selective constraint have reduced archaic ancestry on average indicating that the archaic alleles were deleterious in the hybrid population. More data is needed for a complete picture of these ghost populations. For example, it is unclear whether the archaic signatures found here are from the same as those found in other African populations[13, 14, 15, 33].
YYT: this preprint is mostly about tools and methodology to detect Archaic ancestry; ArchIE, S*-statistic.
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