Genome study into Indian ancestry

From the abstract of this paper: “Genomic reconstruction of the history of extant populations of India reveals five distinct ancestral components and a complex structure” by Analabha Basua, Neeta Sarkar-Roya and Partha P. Majumdera (emphasis mine)

…A distinct ancestry of the populations of Andaman archipelago was identified and found to be coancestral to Oceanic populations. Analysis of ancestral haplotype blocks revealed that extant mainland populations (i) admixed widely irrespective of ancestry, although admixtures between populations was not always symmetric, and (ii) this practice was rapidly replaced by endogamy about 70 generations ago, among upper castes and Indo-European speakers predominantly. This estimated time coincides with the historical period of formulation and adoption of sociocultural norms restricting intermarriage in large social strata. A similar replacement observed among tribal populations was temporally less uniform

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