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From: hes@ecsvax.uncecs.edu (Henry Schaffer)
Newsgroups: sci.bio
Subject: Re: twins
Summary: discordance in MZ twins
Message-ID: <6274@ecsvax.uncecs.edu>
Date: 23 Jan 89 22:02:01 GMT
References: <1046@jimi.cs.unlv.edu>
Organization: NC State Univ.
Lines: 14


From, TEXTBOOK OF HUMAN GENETICS by Max Levitan, 1987, p. 354

In a section on Zygosity Diagnosis, talking about concordance/discordance
in MZ/DZ twins.

"... chromosome abnormalities or mutation may develop in one MZ twin
and not in the other, giving rise to phenotypic differences.  In a few
instances, it has even turned out that twins of unlike sex were really
monozygotic, as one exhibited XO Turner's syndrome and the other was
a normal male, or both were XY by only one showed testicular
feminization."

--henry schaffer  n c state univ