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This is supported by the fact that most skeletons of Neandertals and Cro-Magnon people do not show hybrid characteristics.It would be a mistake to assume that from the time modern Homo sapiens began migrating out of Africa that all people in that continent were modern humans.It is also possible that migrations were not only in one direction--people could have migrated into Africa as well.If interbreeding occurred, it may have been a rare event.By 115,000 years ago, early modern humans had expanded their range to South Africa and into Southwest Asia (Israel) shortly after 100,000 years ago.

Alan Thorne of the Australian National University believes that Australian aborigines share key skeletal and dental traits withuer, of the University of Hamburg in Germany, proposes that the first modern humans did evolve in Africa, but when they migrated into other regions they did not simply replace existing human populations.Dating of the earliest modern human fossils in Asia is less secure, but it is likely that they were present there by at least 60,000 years ago and possibly 100,000 years ago.It would seem from these dates that the location of initial modern Homo sapiens evolution and the direction of their dispersion from that area is obvious. Since the early 1980's, there have been two leading contradictory models that attempt to explain.In 2003, a discovery was made in a Romanian cave named Alan Templeton, also of Washington University, reported that a computer-based analysis of 10 different human DNA sequences indicates that there has been interbreeding between people living in Asia, Europe, and Africa for at least 600,000 years.This is consistent with the hypothesis that humans expanded again and again out of Africa and that these emigrants interbred with existing populations in Asia and Europe.

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