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Handsome By Chance: Why Humans Look Different From Neanderthals

Date:
August 16, 2007
Source:
University of California, Davis
Summary:
Chance, not natural selection, best explains why the modern human skull looks so different from that of its Neanderthal relative. The scientists concluded that Neanderthals did not develop their protruding mid-faces as an adaptation to icy Pleistocene weather or the demands of using teeth as tools, and the retracted faces of modern humans are not an adaptation for language, as some anthropologists have proposed. Instead, random "genetic drift" is the likeliest reason for these skull differences.

Model of the Neanderthal man. Exhibited in the Dinosaur Park Mόnchehagen, Germany.
Credit: iStockphoto/Klaus Nilkens

Chance, not natural selection, best explains why the modern human skull looks so different from that of its Neanderthal relative, according to a new study led by Tim Weaver, assistant professor of anthropology at UC Davis.

"For 150 years, scientists have tried to decipher why Neanderthal skulls are different from those of modern humans," Weaver said. "Most accounts have emphasized natural selection and the possible adaptive value of either Neanderthal or modern human traits. We show that instead, random changes over the past 500,000 years or so – since Neanderthals and modern humans became isolated from each other – are the best explanation for these differences."

Weaver and his colleagues compared cranial measurements of 2,524 modern human skulls and 20 Neanderthal specimens, then contrasted those results with genetic information from a separate sample of 1,056 modern humans.

The scientists concluded that Neanderthals did not develop their protruding mid-faces as an adaptation to icy Pleistocene weather or the demands of using teeth as tools, and the retracted faces of modern humans are not an adaptation for language, as some anthropologists have proposed.

Instead, random "genetic drift" is the likeliest reason for these skull differences.

Weaver conducted the research with Charles Roseman, an anthropologist at the University of Illinois at Urbana-Champaign, and Chris Stringer, a paleoanthropologist at the Natural History Museum in London.

The study appears in the August issue of the Journal of Human Evolution.


Story Source:

The above story is based on materials provided by University of California, Davis. Note: Materials may be edited for content and length.


Cite This Page:

University of California, Davis. "Handsome By Chance: Why Humans Look Different From Neanderthals." ScienceDaily. ScienceDaily, 16 August 2007. <www.sciencedaily.com/releases/2007/08/070813101018.htm>.
University of California, Davis. (2007, August 16). Handsome By Chance: Why Humans Look Different From Neanderthals. ScienceDaily. Retrieved September 22, 2014 from www.sciencedaily.com/releases/2007/08/070813101018.htm
University of California, Davis. "Handsome By Chance: Why Humans Look Different From Neanderthals." ScienceDaily. www.sciencedaily.com/releases/2007/08/070813101018.htm (accessed September 22, 2014).

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