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The basic overall genetic profile of the modern population is consistent with the diversity of ancient populations that would have been indigenous to northeastern Africa and subject to the range of evolutionary influences over time, although researchers vary in the details of their explanations of those influences. Greatest diversity can be illustrated by the fact that all but one of the Afro-Asiatic families, Semitic, is found exclusively in Africa; the African branches are spread from East Africa north, west, and northwest down the Nile to the Mediterranean coast, Sahara, and west Sahel.
As rains came in from equatorial Africa in the early Holocene, the desert became less arid, and people moved into the Sahara from all directions.
There has been scholarly interest in the biological variation and genealogical relationship of the ancient Egyptians to other populations outside of the Egyptian Nile Valley.
There is no scientific reason to believe that the primary ancestors of the Egyptian population emerged and evolved outside of northeast Africa.
Considering this from an evolutionary perspective, we should expect great diversity among indigenous Africans, and this is what has been found, even when northern African populations have been excluded from the research.
All human populations exhibit biological variation in one way or another, and there is no single way to be biologically African—not by skin color, hair form, blood type, or variation of face and nose.