India's caste system is hereditary, and is at least partially racial, because the higher castes are more descended from Aryan invaders.
"20%-30% of Indian mtDNA haplotypes belong to West Eurasian haplogroups, and the frequency of these haplotypes is proportional to caste rank, the highest frequency of West Eurasian haplotypes being found in the upper castes."
Oooh, another thing I just thought of - a friend of mine worked out in the Maldives, and there was a definite hierarchy of white people->Indians->Afrians, with people lower on the hierarchy trying to emulate those further up, through dress, mannerisms, and where possible colour.
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"20%-30% of Indian mtDNA haplotypes belong to West Eurasian haplogroups, and the frequency of these haplotypes is proportional to caste rank, the highest frequency of West Eurasian haplotypes being found in the upper castes."
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