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From: mike@uxf.cso.uiuc.edu (Mike Trogni)
Newsgroups: sci.bio
Subject: Re: Genetic Mosaic Humans
Message-ID: <1989Dec9.184658.9132@ux1.cso.uiuc.edu>
Date: 9 Dec 89 18:46:58 GMT
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Reply-To: mike@uxf.cso.uiuc.edu (Mike Trogni)
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Mark Thorson is correct.  All normal(1) women have two X chromosomes, one
donated from the mother & one from the father.  Since twice of all the
genetic information would be too much, the somatic cells under X-inactivation,
randomly turning off one X chromosome, so if you study carefully traits
that are expressed by somatic cells that are determined genetically, you
will find that women are somatically anyway, a genetic amalgamation.

(1) Some genetic mishaps can occur and some women can end up with three 
    (or more) X chromosomes.  Men can have XYY, etc.  Some scientists used
    to believe that men with XYY chromosomes had a tendency to be criminals!
--
[m-trogni@uiuc.edu]