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Here is an interesting story showing that the development of autism has a strong genetic component. A number of parents who used the same sperm donor had children who developed autism. The sperm donor was an individual with high intelligence and other desirable characteristics according to the sperm bank information.
The first child described is [...]

Loss of a small part of chromosome number 16, (16p11.2), is linked with autism researchers report (University of Illinois at Chicago, University of Chicago Medical Center, and the Roswell Park Cancer Institute)
Researchers think that the 16p11.2 microdeletions may be a risk factor for autism spectrum disorders and may cause mild autism in some [...]