Is Autism genetic?

Hello

Firtly I am not sure exactly where to put this or what to call it. So I appolagise if it is in the rong place. 

I was watching the program about tracing human history through genes earlier this evening. (It is on BBC iPlayer here www.bbc.co.uk/.../) 

I did not find it as insteresting as It could have been, but it was insteresting to watch, I will be watching the seccond epicode tommorow. 
But, It got me thinking about my own genes. I know no-one knows the cause of Autism but I was wondering if it is known if Autism shows up in DNA? Expecially because it can be common for a whole family to be affected-which indicates something genetic. 

Just thought this was an insteresting topic after the program got me thinking. Any thoughts I would love to know. 
Amy  

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