Essay on Where Did We Come From?

1250 Words Dec 2nd, 2014 5 Pages
Where did we come from?
“Where did we come from” is a question that human beings have been trying to figure out for years. Throughout time, we have established many theories that may help us explain it. This paper will mainly focusing on two of the major theories.
The first one is called Regional Continuity Model, which suggests that Homo sapien evolved separately in different regions of the world after some Homo erectus left Africa about two million years ago. “The underlying hypothesis is that a worldwide network of genetic exchange, between evolving human populations that continually divide and reticulate, provides a frame of population interconnection and differentiation” (Wolpoff, P1). The gene flow among each other prevented speciation, which is the major reason why so many different local population around the world happened to evolve with similar morphology.
The second theory is called Replacement Model, which claims that we all came from Africa. They believe Homo sapiens first appears in Africa relatively recently, about 200,000 years ago, and some of them were able to migrate to the rest of the world approximately 60,000 years ago. Researchers were able to use mtDNA to reconstruct family trees by comparing the mtDNA of living individuals from diverse geographic populations and the “preliminary results suggest that the mtDNA of all living humans could be traced back to a ‘mitochondrial Eve’ who lived in Africa some 200,000 years ago”(Haviland, P192). At the…

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