Over at my other blog, Pakistani British Are Very Much Like Indians Genetically. The title doesn’t refer to genome-wide worldwide affinities. Rather, the preprint looks at British Pakistanis, and finds a pattern that is not going to surprise Indians: endogamy seems to have kicked in for these groups starting 1,500 to 2,000 years ago. This is exactly what you see in the Indian jati data. The similarity is pretty incredible, and to me is a strong rejection of the model that these groups were strongly anti-caste so on the margins of Indic civilization.
There is a second wave of endogamy though, dated from 150-500 years ago, roughly. I think this is likely Islamicization and adherence to cousin-marriage. These Pakistani groups seem to show the tendency of jati endogamy common among Hindus, and, cousin-marriage patterns of the Islamic world.
Finally, the reason I posted over on the other blog is that I think this might speak to the long-term trajectories of Bangladesh and Pakistan: Bangladesh is not in the same mold as Indo-Pak societies. The 1000 Genomes data indicate few runs of homozygosity and not much internal structure. That is, no jati endogamy, and, low levels of cousin-marriage.
If you believe Joe Henrich, this means good things for Bangladesh in the future… (vs. Pakistan)
(the Henrich podcast is already available for Patrons)