Evolution of Modern Humans

Topics: Human, Human evolution, Africa Pages: 3 (844 words) Published: April 21, 2008
There are two main theories regarding the origin of modern humans. The first theory suggests that pre modern humans evolved into modern humans prior to leaving Africa and then dispersed in different directions; this theory is called the “Out of Africa Theory”. The second theory suggests that pre modern humans left Africa and dispersed in different directions and evolved into modern humans, this is called the “multi regional theory”. I personally believe in the “out of Africa theory”. I feel there is more concrete evidence that supports the “out of Africa theory” rather than the multi regional theory”. It also seems to me that the “out of Africa theory” is more logical.

The out of Africa model suggests that modern humans evolved relatively recently in Africa, and they then migrated into Eurasia and replaced all the other populations that descended from Homo erectus. This theory is also suggesting that modern human variation is a recent phenomenon in relative terms. In addition, this theory suggests that modern humans migrated and replaced all other human populations with little or no interbreeding. About one hundred and thirty thousand years ago a body plan very similar to our modern anatomy had appeared. However, it should be understood that even though these early humans were very similar in their structure they were very different in the way that behaved. It seems that modern human anatomy existed before modern behavioral patterns. This seems very logical to me because modern behavior is extremely complex and would take more time to develop. The early sapiens had an anatomy that consisted of a cranial vault with a vertical forehead, with a rounded occipital space and a reduced brow ridge, they also had a reduced facial skeleton that lacked a projecting mid face, with a lower jaw supporting a chin, and a more modern built skeleton that wasn’t as vigorous. This anatomical evidence suggests that Neanderthals and early modern humans had been isolated from each...
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