Subject: mitochondrial DNA

Hello I am an eight grade science teacher
 and today in class we began to discuss 
evolution,and the fact that mitochondrial
DNA is passed down from mother to 
daughter with very little change. 
 I read in a text that the DNA in the
 mitochondria stays the same because the
 DNA is from only the egg 
( the male mitochondria is on the tail of
 the sperm).   Somehow into this though, 
 there is variation in male mitochondrial
 DNA and I am not sure how it arises.  If
 you can respond to this it would be 
greatly appreciated.

Thanks!


Jeff Robbins						

Re: mitochondrial DNA