of a Hybrid Population" (Human Biology, vol 37, number 1), led by geneticists D. F. Roberts and R. W. Hiorns, found out the average Northeastern Brazilian to be predominantly European in ancestry (65%), with minor but important African and Native American contributions (25% and 9%). See also Biomes in Brazil Brazil socio-geographic division Demographics of Brazil Notes The number given in parenthesis are percentages relative to Brazil as a whole. The populations for the cities given do not include their metropolitan areas. References Subdivisions of Brazil