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Clues Boost 'Out of Africa' Theory
invictus
follow
12
7-19-2007 12:48 PM
472 views
tags:
anthropology
,
mitochondrial dna
,
africa
,
homo sapiens
,
science
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/3bc35745-07b2-424c-a865-3975fe31391f/35EDC494-4EF2-4798-955A-7200DF424296/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://dsc.discovery.com/news/2007/07/18/outofafrica_hum.html?category=human&guid=20070718153030&dcitc=w19-506-ak-0005" href="http://dsc.discovery.com/news/2007/07/18/outofafrica_hum.html?category=human&guid=20070718153030&dcitc=w19-506-ak-0005" style="font-size: 11px;">dsc.discovery.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://dsc.discovery.com/news/2007/07/18/outofafrica_hum.html?category=human&guid=20070718153030&dcitc=w19-506-ak-0005"><SPAN class="primeColor">Clues Boost 'Out of Africa' Theory</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://dsc.discovery.com/news/2007/07/18/outofafrica_hum.html?category=human&guid=20070718153030&dcitc=w19-506-ak-0005"><P><B>July 18, 2007</B> — Twenty years after it was popularized, the "Out of Africa" theory, which posits that modern humans originally came from Africa before spreading out in a global conquest, has received an emphatic boost, scientists said on Wednesday. </P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://dsc.discovery.com/news/2007/07/18/outofafrica_hum.html?category=human&guid=20070718153030&dcitc=w19-506-ak-0005"><P>Rival theories about the rise of <I>Homo sapiens sapiens</I>, as anatomically modern man is called, say humans either came from a single point in Africa or among different populations in different parts around the world, who evolved independently from a forebear, <I>Homo erectus</I>.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://dsc.discovery.com/news/2007/07/18/outofafrica_hum.html?category=human&guid=20070718153030&dcitc=w19-506-ak-0005"><P>The "Out of Africa" scenario has been underpinned since 1987 by genetic studies based mainly on the rate of mutations in mitochondrial DNA, a genetic material inherited from the maternal line of ancestry.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://dsc.discovery.com/news/2007/07/18/outofafrica_hum.html?category=human&guid=20070718153030&dcitc=w19-506-ak-0005"><P>The "multiple origins" school, meanwhile, points out that human skulls from around the world have clearly different characteristics, and argues that this proves our species evolved in slightly different forms more or less simultaneously.</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/35EDC494-4EF2-4798-955A-7200DF424296/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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