He Rex or She Rex? - Tell Dino Gender

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	He Rex or She Rex? - Tell Dino Gender

TequilaBebop

1-15-2008 8:12 AM

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TequilaBebop says:

"A Tyrannosaurus rex unearthed in Montana has undergone a sex change now that scientists have discovered a way to tell the gender of fossilized dinosaurs."

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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/63514892-d4a2-481e-86ae-baa52bbbf710/2CAFA5A5-B746-4B42-A668-B7849CFB5BCC/" 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://news.nationalgeographic.com/news/2005/06/0602_050602_dino_sex.html" href="http://news.nationalgeographic.com/news/2005/06/0602_050602_dino_sex.html" style="font-size: 11px;">news.nationalgeographic.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://news.nationalgeographic.com/news/2005/06/0602_050602_dino_sex.html">
Named Bob—after its discoverer, paleontologist Bob Harmon—the remarkably well preserved Jurassic giant has turned out to be a female. "Perhaps we should now call it Bobette," said Mary Schweitzer,</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://news.nationalgeographic.com/news/2005/06/0602_050602_dino_sex.html"><DIV> Until now this had been an almost impossible task, because all obvious gender indicators vanish when soft tissues decay during fossilization. </DIV></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://news.nationalgeographic.com/news/2005/06/0602_050602_dino_sex.html"><DIV> The new method focuses on a specialized layer of bone similar to one found in living birds. Furthermore, the study team says, the discovery that dinosaurs can be sexed in this way adds to the evidence that birds are directly descended from dinosaurs. </DIV></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://news.nationalgeographic.com/news/2005/06/0602_050602_dino_sex.html">In-depth analysis of fossil fragments showed the limb contains medullary bone, a substance previously known only in female birds.</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://news.nationalgeographic.com/news/2005/06/0602_050602_dino_sex.html"><DIV> Medullary bone is rich in calcium, providing female birds a ready source of material for making eggshells. So this particular <I>T. rex, </I>the researchers say, must have been an egg layer, too. </DIV></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://news.nationalgeographic.com/news/2005/06/0602_050602_dino_sex.html"> "Unlike mammals, we don't see [gender] differentiation in the skeletons of reptiles,"</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;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/2CAFA5A5-B746-4B42-A668-B7849CFB5BCC/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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