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Strategies & Market Trends : 2026 TeoTwawKi ... 2032 Darkest Interregnum -- Ignore unavailable to you. Want to Upgrade?

To: Seeker of Truth who wrote (60563)	1/31/2010 11:00:32 AM
From: TH	Read Replies (1) \| Respond to of 218863

An interesting question is how much is lost over generations by the X and the Y. This book discusses the topic in depth, and provides some surprising hypothesis's on how and when human's evolved certain features (like loss of hair) that cannot be addressed by the fossil record. Before the Dawn: Recovering the Lost History of Our Ancestors amazon.com GT TH Male sex chromosome losing genes by rapid evolution, study reveals Published: Thursday, July 16, 2009 - 19:22 in Biology & Nature esciencenews.com Scientists have long suspected that the sex chromosome that only males carry is deteriorating and could disappear entirely within a few million years, but until now, no one has understood the evolutionary processes that control this chromosome's demise. Now, a pair of Penn State scientists has discovered that this sex chromosome, the Y chromosome, has evolved at a much more rapid pace than its partner chromosome, the X chromosome, which both males and females carry. This rapid evolution of the Y chromosome has led to a dramatic loss of genes on the Y chromosome at a rate that, if maintained, eventually could lead to the Y chromosome's complete disappearance. The research team, which includes Associate Professor of Biology Kateryna Makova, the team's leader, and National Science Foundation Graduate Research Fellow Melissa Wilson, will publish its results in the 17 July 2009 issue of the journal PLoS Genetics. "There are three classes of mammals," said Makova, "egg-laying mammals, like the platypus and the echidna; marsupials, like the opossum and the wallaby; and all other mammals -- called eutherians -- which include humans, dogs, mice, and giraffes. The X and Y chromosomes of marsupials and eutherians evolved from a pair of non-sex chromosomes to become sex chromosomes."

To: Seeker of Truth who wrote (60563)	1/31/2010 2:04:40 PM
From: ItsAllCyclical	Respond to of 218863

X has a lot more chromsomes than Y. That's also part of the reason why boys are more susceptible to various genetic diseases. From memory I think X has approx 5-10x more than Y.

To: Seeker of Truth who wrote (60563)	1/31/2010 7:49:19 PM
From: TobagoJack	Respond to of 218863

hello seeker, i will dig into this issue a bit, just out of curiosity i have some news for you cheers, tj

To: Seeker of Truth who wrote (60563)	1/31/2010 10:45:03 PM
From: THE ANT	Read Replies (4) \| Respond to of 218863

X chromosome is heavier with more genetic material than Y or at least that was what I was taught in med school.The male XY has more genetic material from his mother.Girls are 50/50

To: Seeker of Truth who wrote (60563)	2/1/2010 12:19:50 AM
From: energyplay	Respond to of 218863

Y chromosome self repair using palindromes is neat - en.wikipedia.org