Question on X chromosome

[Ron Apland]

>>This is a question that no one at York university seems able to
>>answer.
>>The question is as follows:-
>>
>>In females one X chromosome stays active and codes for proteins where
>>as the other chromosome is (supposedly) inactive and forms the dense
>>bar body which can be visibly seen under an optical microscope.
>>
>>Are the inactive X,s truelly inactive?
> 
> AFAIK, only some sections of the X chromosome are inactivated. This means
> that some genes on the X escape inactivation. I think it's also possible
> for mutations to occur that affect the inactivation of particular genes.
> 
>>Or something entirely different.

How would you account for sex-linked traits unless regions of both X
chromosomes were active?

Ron