Subject: Is an 'XXY' male less likely than an 'XY' male to have sex linked disorders

One of my students asked that question during a lesson on sex-linked traits and 
sex chromosome disorders (Klinefelters' syndrome and Turner's syndrome).  My 
first thought was that the second "X" chromosome might be non-functional and, 
therefore, not confer any protection from sex-linked disorders such as 
hemophilia, color-blindness, etc. but I'm  hoping someone can confirm or deny 
that theory.  I thought it was a great question and wish I could've given him 
an immediate (and accurate) answer!

Re: Is an 'XXY' male less likely than an 'XY' male to have sex linked disorders