Is autism transmitted?

Its not contagious, if that's what you mean. There are genetic links that run in families, so in that sense there is greater likelihood of ending up with autism or something related if one or more of your biological parents have it. But, genetics is very far away from being able to predict what child will get it, given the parent's symptoms. If this is your concern, find a genetic counselor for the latest...
Short Answer NO. not in the sense that autism can pass from one person to another like an infection. But there certainly are genetic factors that can make it likely to be passed from one generation to another. If one twin has it, there is a greater chance the second twin has it, but it is not 100%