Compare these Tamil Brahmins[1] and Punjabi Dalits[2]. Punjab is in Northwest India, Tamil Nadu the extreme south. They’re the same skin color. You can tell from the abstract that article is trash just fro what it scare quotes. “genes”

[1] https://commons.m.wikimedia.org/wiki/File:Tamil_brahmins_at_... [2] http://sanhati.com/articles/20079/