>>14352658The genetics do not check out.
Haplogroups tell the tale. The R1a1a wave from the Aryan "settlement" is already a bottleneck selecting for a conqueror archetype (we know it was conquest because of the ridiculous disparity in Y-DNA vs mtDNA prevalence of R1a).
Then, we can infer that there was a spatially and temporally diffuse second round of selection from the migration of high performing brahmins south and eastward via invitations to royal courts, general movement over time, etc. The remoteness of the southern Brahmins allows us to assume that they didn't just walk over there for normal migratory reasons, and that they were brought for their economic or clerical value, so we establish the existence of a second bottleneck, selecting for an "intellectual" archetype (as much as routine clerical and administrative/governing work can be considered intellectual. This pattern probably existed for a few other Brahmin groups, but the most glaring example are still the Tamil Brahmins, as they are so genetically distinct from the native population as to be more similar to Afghans than to the local low caste Tamil populace. Furthermore, they've the genetic privilege of their ancestors' passage through the Khyber Pass, which affords them two very fortunate bottlenecks (conqueror + intellectual). That combination of bottlenecks followed by centuries of inbreeding is what has allowed such anomalies as Ramanujan to ever come to being in the first place.
The elite Brahmin communities are so anomalous and not even genetically related to the populations of the land that they now inhabit. The average Tamil Brahmin has closer genetic similarity to an Afghan than to a low caste Tamil. The communists tried to destroy the caste system, but that just caused all the Brahmins with the intellectual or financial means to leave. Thus, the third bottleneck has happened as well, and the offspring of these Indians in the US, UK, etc. will comprise its product.
