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01 Oct

Whereas then researchers looked at a few hundred markers on the Y chromosome, or perhaps some regions with very high diversity, today they can sequence most of the Y chromosome.

In line with Wells' original suspicion, after looking at whole genomes, many scholars now surmise that R1a1a entered South Asia within the last 4,000-5,000 years from the Eurasian steppe.

Behind the gently arcane scholarly language, the paper argues that the genetic ancestry of all modern Indians displays evidence of significant mixing with populations that moved to the subcontinent from northern Iran and the Caspian region some 4,000-5,000 years ago.The reason R1a1a is not diverse is that it underwent a massive, recent expansion; not much time has elapsed for mutations to accumulate.With whole genome analysis, one can see that East European R1a1a is one lineage, while Central Asian and South Asian R1a1a strains form another.Many researchers, contra Wells, contended that R1a1a may have been indigenous to South Asia.Today, we know more about R1a1a than we did in the 2000s.