Aborigines are an endogamous society.This means that marriage and reproduction take place within the group leading to

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Endogamous societies are characterized by marriages within the same social or cultural group. This tends to reduce genetic diversity in the population as there is limited gene flow from outside the group. While genetic drift may occur in endogamous societies, it does not lead to increased genetic diversity. Migration without gene flow is not relevant to the question. Exogamous societies, on the other hand, are characterized by marriages outside the group which can lead to increased genetic diversity through admixture.

Aborigines Are an Endogamous Society