Difference between revisions of "28. Explain the diffusionism/ Out of Africa hypothesis"

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The '''Out of Africa Hypothesis''' states that the ancestral population of all living people was a small, isolated group that migrated from Africa to different regions of the world, replacing the native populations as they spread and proved themselves superior and more proficient.
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Return to [[History 8 Human Origins Concepts]]
  
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However, this is not the only theory that explains where we originated. The '''Multiregional Hypothesis''' proposes that many different types of early humans evolved in Africa, Europe, and Asia during the same time frame, resulting in some interbreeding. The support for this theory includes minor anatomical similarities between modern humans and previous populations of ''H. Erectus'' in the same regions.
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The Out of Africa hypothesis is the second proposed idea about the origin of the modern homo sapiens. This more popular explanation says that a small and isolated group of early humans developed into homo sapiens. It continues to state that this group successfully spread across Africa, Europe, and Asia, eventually replacing all other species as they spread. Molecular biology, more specifically mitochondrial DNA help support this idea, as ann approximate time of seperation from modern humans from the common ancestor can be taken from DNA. Research showed that this divergence happened around 200,000 years ago, too early for the Multiregional Hypothesis.
  
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http://www.signsofcreation.com/images_definitivereply/sapiens.jpg
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http://www.bio.miami.edu/dana/pix/out_of_africa.jpg
  
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Though the Multiregional Hypothesis has reasonable support, the Out of Africa Hypothesis also has evidence that supports its theory. Using molecular biology, we can determine the mutation rate of nuclear and mitochondrial DNA in living human cells of populations that live outside of Africa. This research has revealed dates of 200,000 years ago, which proves too young for the Multiregional Hypothesis, and rendering it less credible. Similar molecular methods have also implied that all modern humans came from an African origin, further validating the Out of Africa Hypothesis.
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Sources:
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SJS Manual Page 38
  
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Sources:
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http://archaeology.about.com/od/oterms/g/outofafrica.htm
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"Signs of Creation.com." Signs of Creation.com. Web. 25 Oct. 2014. <http://www.signsofcreation.com/darwinismwatch04.htm>.
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"First Step out of Africa." Open 1 Feb. 2012. General OneFile. Web. 25 Oct. 2014.
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- Leila Pulaski
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Lab Manual pages 27-28
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Sara Lichtarge
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Latest revision as of 09:02, 23 October 2015

Return to History 8 Human Origins Concepts

The Out of Africa hypothesis is the second proposed idea about the origin of the modern homo sapiens. This more popular explanation says that a small and isolated group of early humans developed into homo sapiens. It continues to state that this group successfully spread across Africa, Europe, and Asia, eventually replacing all other species as they spread. Molecular biology, more specifically mitochondrial DNA help support this idea, as ann approximate time of seperation from modern humans from the common ancestor can be taken from DNA. Research showed that this divergence happened around 200,000 years ago, too early for the Multiregional Hypothesis.

out_of_africa.jpg

Sources: SJS Manual Page 38

http://archaeology.about.com/od/oterms/g/outofafrica.htm

- Leila Pulaski

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