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From: emigh@ecsvax.UUCP (Ted Emigh)
Newsgroups: sci.med
Subject: Re: sex and color
Message-ID: <2241@ecsvax.UUCP>
Date: Mon, 10-Nov-86 15:42:40 EST
Article-I.D.: ecsvax.2241
Posted: Mon Nov 10 15:42:40 1986
Date-Received: Wed, 12-Nov-86 02:26:41 EST
References: <2302@bucse.bu-cs.BU.EDU> <7858@tekecs.TEK.COM>
Reply-To: emigh@ecsvax.UUCP (Ted Emigh)
Organization: NC State University
Lines: 19


In article <7858@tekecs.TEK.COM> mikes@tekecs.TEK.COM (Michael Sellers) writes:
>In article <2302@bucse.bu-cs.BU.EDU>, gasp@bu-cs.BU.EDU (Isaac Kohane) writes:
{{{{Text deleted so inews would accept this posting -- you'll have to look
     it up yourselves}}}}

Actually, each female somatic cell has only one activated X chromosome.  Which
one is activated is random, and once inactivated all daughter cells will have
the same X chromosome(s) inactivated.  X-inactivation occurs early in
development, but each eye contains a mixture of cells with each of the Xs
inactivated (as demonstrated by females who are heterozygous for occular
albinism).

A quick search through "Mendelian Inheritance in Man" by VA McKusick does not
show up any answers to this question (6th Edition, I don't have a copy of
the 7th edition yet).  Since we can't tell if the "Red" seen by any other
person is exactly the same as the "Red" seen by use, I would think there
would be no practical difference between males and females  -- females
may see things a little bit more red.