monogenist

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mo·nog·e·nism

M0394000 (mə-nŏj′ə-nĭz′əm)n. The theory that all humans are descended from the same ancestors. Also called monogeny.
mo·nog′e·nist n.

monogenist

(mɒˈnɒdʒəˌnɪst) n (Anthropology & Ethnology) a person who subscribes to the proposition that all humankind has one couple of common ancestorsadj (Anthropology & Ethnology) relating to the monogenist proposition. Also called: monogenistic