What is the most common genetic abnormally?

[RICK]

Mark Brandt, Ph.D. wrote:
> 
> In article <33A367BC.4B7E at sprynet.com.ns>, kakapo at sprynet.com.ns wrote:
> 
> > What is the most common genetic abnormally?
> >

At what point does an abnormality become an anomally or a varient? skin 
color, hair color etc. do we say blonds have a genetic abnormality that 
allows them to be predisposed to skin cancer? Just a point to muse.
Rick