boys 4 times more likely to get autism

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Below is a video discussing the genetics of autism.  If one twin has autism,  an identical twin has a 90% chance of having autism or an  autistic spectrum disorder.  That is a very high heritability  rate.  Boys are 3  to 4 times more likely to have autism than girls.  No one gene is implicated; it appears to be combinations of genes that are  involved.

[youtube]http://www.youtube.com/watch?v=CjdTaiJuFu0[/youtube]