Changes

Genetic variation among modern humans is relatively limited to most species found on Earth. Populations within Africa were often isolated, developing more diverse genetic variation over time. Once populations left Africa, that diversity began to diminish. Despite physical traits that show variety among humans today in wide regions, the fact is most of those populations show very similar genetic makeup with some input from much older Hominid hominid populations and some early modern humans who migrated before the great migration that occurred between 80-50 thousand years ago. There seems to have been a In effect, since about 80,000 years ago, humans became far more mobile, whereas migration was very limited perhaps for more than 100,000 years in the evolution of <i>Homo sapiens</i>. The next great split divergence between migratory human populations by occurred at about 40,000 years ago, where part of the populations migrated towards Europe and the other part into east Asia and eventually North and South America.