Question on X chromosome

Ron Apland apland at
Thu Dec 5 10:24:16 EST 1996

>>> 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.
>>How would you account for sex-linked traits unless regions of both X
>>chromosomes were active?
> Why would you _need_ a gene to be active on _both_ chromosomes??
> Wouldn't one or the other be enough?

Yes, of course.  What I was trying to account for was the different
frequencies.  I guess I'm to assume that the difference in frequencies
of traits such as R-G colour blindness is not as large as I thought.


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