Size of Y Chromosome
- From: Dr Umesh Bilagi <umeshbilagi@xxxxxxxxx>
- Date: Sat, 23 Jun 2007 07:45:17 -0700
Please check out this
http://www.learner.org/channel/courses/biology/textbook/gender/gender_4.html
http://www.npr.org/templates/story/story.php?storyId=4225769&sc=emaf
I read that size of Y chromosome has reduced because it did not have
partner at all. but X chromosome has not reduced, they say that it is
because, it has partner in female sex to recombine.
If Chromosome don't get partner to recombine than there is tendency to
delete genes which may be harmful produced by mutation. which intern
will reduce the size of chromosome is the logic.
Now if X chromosome gets only 50% chances to recombine then I think
size of X chromosome should also reduce to a size in between Y and its
initial size in reptiles
If gene deletion by natural selection if it is correct why there is
preservation of X chromosome size when it has only 50% Chance to
exchange with its real partner. It should also have 50% disadvantage.
How is this?
This is my guess. Please comment.
.
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