Why are some bio-ethnic groups more prone to diseases like Autism than others

Question

I've noticed Germanic and Ashkenazi Jews tend have extremely high rates of Autistic Spectrum Disorders relative to the other groups of humans. Is there a correlation between capacity for gifted-level I.Q.s and also the potential for Autism as well.As the Ashkenazi are really a hybrid Germanic-Turkic people.

Answer 1

It's a result of "over" natural selection, just like certain African groups are prone to Sickle-cell Anemia. The upside, is that those same Africans are immune to malaria, and Ashkenazi Jews are considered to be the ethnicity with the highest I.Q.'s...