[Deanesmay-announce] New post at Dean's World

[notify at powerblogs.com]

Hello,
	There is a new post on Dean's World.  You can read it at:

http://www.deanesmay.com/posts/1141753070.shtml

It begins:

	This month's edition of National Geographic
	magazine discusses how genetic markers passed down
	to us from our ancestors are leading scientists
	back across time to trace human migration patterns:
	"By comparing markers in many different
	populations, scientists can trace their ancestral
	connections. In most of the genome, these minute
	changes are obscured by the genetic reshuffling
	that takes place each time a mother and father's
	DNA combine to make a child. Luckily a couple of
	regions preserve the telltale variations. One,
	called mitochondrial DNA (mtDNA), is passed down
	intact from mother to child. Similarly, most of the
	Y chromosome, which...