"Lower castes are genetically closer to the upper castes of their own region than to people of the same caste rank in other parts of India. A recent survey has yielded this conclusion: “Detailed anthropomorphic surveys carried out among the people of Uttar Pradesh, Gujarat, Maharashtra, Bengal and Tamil Nadu revealed significant regional differences within a caste and a closer resemblance between castes of different varnas within a region than between sub-populations of the caste from different regions.”"