Apparently, Indian population is an excellent study medium for genetic analysis considering the huge endogamous subdivisions of population.
"The researchers showed that most Indian populations are genetic admixtures of two ancient, genetically divergent groups, which each contributed around 40-60% of the DNA to most present-day populations"
"...whereas European ancestry is mostly carved up by geography, Indian segregation was driven largely by caste. "There are populations that have lived in the same town and same village for thousands of years without exchanging genes," says Reich..."
More studies like this might reveal interesting and useful patterns of genetic diseases/resistances, helping us to understand the human genome from clinical perspective.
