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Here we analyze data from about 60 South Asian groups to estimate that major ANI-ASI mixture occurred 1,200-4,000 years ago.Some mixture may also be older--beyond the time we can query using admixture linkage disequilibrium--since it is universal throughout the subcontinent: present in every group speaking Indo-European or Dravidian languages, in all caste levels, and in primitive tribes.The Jatt community in particular seems to have the highest in the subcontinent.There are inchoate theories for the origins of the Jatts in Central Asia.Once Zack has the genotype one of the primary things he does is add it to his broader data set (which includes many public samples) and analyze it with the Admixture model-based clustering package.What Admixture does is take a specific number of populations (e.g.
So, for example, the “S Indian” component peaks in southern India.K = 12) and generate quantity assignments to individuals.So, for example individual A might be assigned 40% population 1 and 60% population 2 for K = 2.I will combine these last three together as “Asian.” Below is a table, mostly individuals from Zack’s results (though there are some aggregate results from public data sets). A recent paper suggested that there was a single pulse of admixture between South and East Asians in the environs of what is today Bangladesh which occurred ~500 A. The traditional accounts for the arrival of Brahmins to Bengal suggests a period around and after 1000 A. (Bengal was one of the last redoubts of institutional Buddhism in northern India, so presumably would have less need for the services of Brahmins).The results are easy to align with these two facts.