A report from the California Autism Twins Study shows a significantly greater concordance of autism among dizygotic twins than previously reported. The authors conclude, "A large proportion of the variance in liability can be explained by shared environmental factors (55%; 95% CI, 9%-81% for autism and 58%; 95% CI, 30%-80% for ASD) in addition to moderate genetic heritability (37%; 95% CI, 8%-84% for autism and 38%; 95% CI, 14%-67% for ASD)."
http://archpsyc.jamanetwork.com/article.aspx?articleid=1107328
I strongly recommend reading the book, More Than Genes, by Dan Agin. That will inform you greatly on this topic.
One other point, behavior genetic probability statements about heritability are very misleading. They do NOT apply to individual cases, where the causal agent may be 100% environmental in the presence of a given individual genome!
Here is a link to my recent review of the topic.
Article The Plausibility of Maternal Toxicant Exposure and Nutrition...
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