(no subject)

ILC Lab Machine thanhv at uci.edu
Thu Nov 9 20:14:31 EST 1995

I have a question regarding the sex chromosomes. The X and Y 
chromosomes, do they ever cross-over and exchange the genetic materials. 
I'm asking that because I see they are not in the same shape. And if 
they don't cross over, does it mean all male descendants of the same 
male will have the same Y chromosome?

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