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The rate of inheritable mutations for a species or a population can vary due to a number of factors including generation time, the efficiency of DNA repair within cells, ambient temperature, and varying amounts of natural environmental mutagens.
In addition, some kinds of DNA molecules are known to be more subject to mutation than others, resulting in faster mutation rates.
Their skeletons and musculature generally were less massive than the Neandertals.
The Cro-Magnon had broad, small faces with pointed chins and high foreheads.
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.
From this view, the regional anatomical differences that we of this model believe that the ultimate common ancestor of all modern people was an early Homo erectus in Africa who lived at least 1.8 million years ago.
It is further suggested that since then there was sufficient gene flow between Europe, Africa, and Asia to prevent long-term reproductive isolation and the subsequent evolution of distinct regional species.
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.