Abstract
The Crow's index of opportunity for natural selection has been calculated for three endogamous subpopulations namely Arya Vysya, Thrivarnika and Kalinga Vysya of North Coastal Andhra Pradesh. The total index is in the order Arya Vysya > Thrivarnika > Kalinga Vysya. However, the mortality component is more in Kalinga Vysya, reflecting the poor medical facilities available to them due to their low socio- economic profile compared to other two populations. The results of the present study are compared with those among the other caste populations of Andhra Pradesh.
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