Origins of Hutu, Tutsi and Twa on economic criteria. Formal and discrete social divisions were consequently imposed upon ambiguous biological distinctions. To some extent, the permeability of these categories in the intervening decades helped to reify the biological distinctions, generating a taller elite and a shorter underclass, but with little relation to the gene pools that had existed a few centuries ago. The social categories are thus real, but there is little if any detectable genetic differentiation between Hutu and Tutsi. Tishkoff et al. (2009) found their mixed Hutu and Tutsi samples from Rwanda to be predominately of Bantu origin, with minor gene flow from Afro-Asiatic
Tutsi closely related to each other than to faraway groups. There are essentially two groups of Tutsi in the Congo (DRC). There is the Banyamulenge that live in the southern tip of South Kivu. They are descendants of migrating Rwandan, Burundian and Tanzanian pastoralists. And secondly there are Tutsi in North Kivu and Kalehe in South Kivu - being part of the Banyarwanda (Hutu and Tutsi) community. These are not Banyamulenge. Some of these Banyarwanda are descendants of people that lived long before colonial rule in Rutshuru - on what's currently Congolese territory. Others migrated or were "transplanted" by the Belgian