What is the most common genetic abnormally?

[Steven B. Harris]

In <33A367BC.4B7E at sprynet.com.ns> Elliot Williams
<kakapo at sprynet.com.ns> writes: 
>
>What is the most common genetic abnormally?
>
>Is hemochromatosis (iron overload) the most common genetic
>abnormally?
>
>Heterozygous (single gene) 1 in 8
>Homozygous (double gene) 1 in 200
>(source: http://www.emi.net/~iron_iod/io42000.html).
>
>What are the other common genetic abnormalities?
>
>E. Williams
>kakapo at sprynet.com
>


   About 1 in 20 carries the gene for cystic fibrosis, with the
homozygous frequency being about 1 in 4*(20)^2 = 1600.  Of course, the
frequency of these things varies with the population.

                          Steve Harris, M.D.