Homo erectus

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Homo erectus are hominins. It is estimated that Homo erectus first inhabited the earth 1.9 Ma, before they died out 200, 000 years ago. Compared to autralopithecines sexual dimorphism in Homo erectus was less intense. Their development was more similar to apes than to modern day humans with their first permanent molars appearing at the age of 4-5 years old. Africa, Europe, Southeast Asia are just a few of the spots where Homo erectus fossils have been located.[1]

Multiregional Hypothesis

This theory suggests that Homo erectus left Africa for the Old World where they later evolved into Homo sapiens. In order for the multiregional model to work there would have needed to be gene flow between seperate populations of Homo erectus, so that speciation is avoided. This model suggests that Homo sapiens did not just appear in one region.[2]

Out of Africa Hypothesis

This model argues that Homo sapians first appeared in Africa. Homo erectus migrated and evolved into seperate populations such as Neanderthals. Homo sapiens then left Africa and displaced all other hominin populations [3].

References

  1. Hartl, D.L. and Ruvolo M. (2012) Genetics: Analysis of Genes and Genomes. 8th ed. London: Jones and Bartlett Learning International.
  2. Johanson, D. (2001) Origins of Modern Humans Multiregional or Out of Africa? [Internet], Available from: <http://www.actionbioscience.org/evolution/johanson.html#> [Accessed 25 November 2014].
  3. Johanson, D. (2001) Origins of Modern Humans Multiregional or Out of Africa? [Internet], Available from: <http://www.actionbioscience.org/evolution/johanson.html#> [Accessed 25 November 2014].
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