Joe Morlan wrote:
>
>Hi Al,
>
>If I remember this right, color blindness is carried on the X chromosome
>and is thus carried via the maternal side. However, the gene is
>expressed predominantly, but not exclusively in males.
>
Now this makes more sense, I knew I had something wrong. By virtue of being
on the X chromosome the feature is expressed in males since they don't have
another X chromosome that may have the gene that overrides the expression of
colour blindness. Women on the other hand are less likely to show the trait
since it would be expressed only if it is carried by both X chromosomes as
the trait is recessive. Now is this right?

Alvaro Jaramillo "You are better off not knowing
Half Moon Bay, CA how sausages and laws are made"
- From fortune cookie, Vancouver
alvaro at quake.net circa 1994
http://www.quake.net/~alvaro/index.html