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Your DNA from the chromsomes in the cell nucleus came equally from either of the parents. Males get the small y from their father, and the unbalanced X comes entirely from the mother. Another exception is the mitochondria, they are thought to have once been an invading species, then became a symbiont, as they produce the energy for the cells use. They have their own DNA, outside the nucleus. The sperm has no mitochondria, all your mitochondria comes entirely from the mother. A recent discovery was that one type of diabetes is inherited only in the mothers line, as defective mitochondria. Male baldness and some other disorders are usually inherited only from the mothers line, even though she is not bald, because it is on the X chromosome. If you have a Y, it came from Dad, therefore the X is from Mom. Cordially, Charles W. Scouten, Ph.D. myNeuroLab.com 5918 Evergreen Blvd. St. Louis, MO 63134 Ph: 314 522 0300 x 342 FAX 314 522 0377 [log in to unmask] http://www.myneurolab.com -----Original Message----- From: Parkinson's Information Exchange Network [mailto:[log in to unmask]] On Behalf Of rayilynlee Sent: Sunday, October 23, 2005 2:03 PM To: [log in to unmask] Subject: Re: Bad genes in families Maryse, I don't know, just think I read it somewhere, something about mitochondrial DNA Ray ----- Original Message ----- From: "M.Schild" <[log in to unmask]> To: <[log in to unmask]> Sent: Saturday, October 22, 2005 10:57 PM Subject: Re: Bad genes in families >> Isn't it through the mother's side that one inherits the bad stuff? > > > why just the motherīs side? > Maryse > > ---------------------------------------------------------------------- > To sign-off Parkinsn send a message to: > mailto:[log in to unmask] > In the body of the message put: signoff parkinsn ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn