And hath made of one blood all nations of men for to dwell on all the face of the earth,
and hath determined the times before appointed, and the bounds of their habitation;
Acts 17:26
"As a consequence of Babel, the people groups could not easily
mix. They became genetically isolated, meaning that they married and had offspring primarily within their particular group. As the years passed, each group developed its own culture and ways of doing things. Genetically isolated, certain physical traits became more prominent in each group. These ethnic characteristics are wrongly considered racial characteristics; but there really is only one race, the human race. All of these people were simply people." AIG
As a consequence of Babel,
the people groups became genetically isolated.