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.
In families linked to a mutated HPCX gene, the defect is always passed on from the mother: In this case, a father cannot pass the disease to his son. (X and Y are the sex chromosomes, and they distinct pattern of inheritance. Fathers always pass along the Y chromosome to their sons.