The African replacement, "out of Africa," Noah's ark model of Christopher Stringer and Peter Andrews:

All other lines of humans that had descended from Homo erectus presumably became extinct.  From this view, the regional anatomical differences that we see among humans today are recent developments--evolving mostly in the last 40,000 years. 

Christopher Stringer and Peter Andrews proposes that modern humans evolved from archaic Homo sapiens, (Noah?), 200,000-150,000 years ago [Gen 8:3] only in Africa, (before the flood!) and then some of them migrated into the rest of the Old World replacing all of the Neandertals and other late archaic Homo sapiens beginning around 100,000 years ago. 

If this interpretation of the fossil record is correct, all people today share a relatively modern African ancestry.  All other lines of humans that had descended from Homo erectus presumably became extinct.  From this view, the regional anatomical differences that we see among humans today are recent developments--evolving mostly in the last 40,000 years. 

Gunter Brauer, 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.  

Rather, they interbred to a limited degree with late archaic Homo sapiens, (Noah), resulting in hybrid populations.  In Europe, for instance, the first modern humans appear in the archaeological record rather suddenly shortly before 40,000 years (of days and nights) ago.  

The abruptness of the appearance of these Cro-Magnon people, (Noah-ians), could be explained by their migrating into the region from Southwest Asia and possibly North Africa.  

They apparently shared Europe with Neandertals for another 12-14,000 years: [Gen 8:10,11]  

During this long time period, it is argued that interbreeding occurred and that the partially hybridized predominantly Cro-Magnon population ultimately became modern Europeans. 

In 2003, a discovery was made in a Romanian cave named Peatera cu Oase that supports this hypothesis.  

It was a partial skeleton of a 15-16 year old male Homo sapiens who lived about 30-35,000 years ago: [Gen. 9:28].  He had a mix of old and new anatomical features.  The skull had characteristics of both modern and archaic Homo sapiens. [Noah!!]

This could be explained as the result of interbreeding with Neandertals according to Erik Trinkaus of Washington University in St. Louis.  

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.