Directional Selection


	Directional Selection

stanstan009

9-4-2008 7:07 AM

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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/d40e29d7-1843-4e57-a541-cca9bc3901b0/607FAD2B-34F2-45A0-8E83-D0CA19D3389C/" 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://www.starsandseas.com/SAS%20Evolution/SAS%20natselection/natselec_directional.htm" href="http://www.starsandseas.com/SAS%20Evolution/SAS%20natselection/natselec_directional.htm" style="font-size: 11px;">www.starsandseas.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.starsandseas.com/SAS%20Evolution/SAS%20natselection/natselec_directional.htm"><P>Directional selection favors those individuals who have extreme variations 
        in traits within a population. A useful example can be found in the breeding 
        of the greyhound dog. Early breeders were interested in dog with the greatest 
        speed. They carefully selected from a group of hounds those who ran the 
        fastest. From their offspring, the greyhound breeders again selected those 
        dogs who ran the fastest. By continuing this selection for those dogs 
        who ran faster than most of the hound dog population, they gradually produced 
        a dog who could run up to 64km/h (40mph). </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://www.starsandseas.com/SAS%20Evolution/SAS%20natselection/natselec_directional.htm"><H2>Directional Selection</H2></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/607FAD2B-34F2-45A0-8E83-D0CA19D3389C/blog/" title="blog or email this clip"><img src="http://content7.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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