I'm guessing that's why some of the SPY's dividends are unqualified. Page 34 of the same website contains the tax information for the DIA. The DIA paid $2.93 a share in 2008, all of which is qualified.
The mutated gene is passed down through a family, and each generation of children can inherit the gene that causes the disease. Rarely, one of these monogenic diseases can occur spontaneously in a child when his/her parents do not have the disease gene, or there is no history of the disease in the family.
Most importantly it's not a disease, it's a genetic disorder. It is a gene mutation that affects 1 in 3000 people. It is usually passed on though birth but sometimes just pops up with no family history of it. All you can do is take one day at a time and enjoy life.