It is not that genes account for all of the risk for autism, but yet they account for a lot of that risk, because when you look at fraternal twins, that concordance rate is only 31 percent.
Maksudnya, gen bukanlah punca mutlak autisme namun is penyumbang terbesar risiko autisme kerana apabila kita lihat kembar tak seiras, kadar kesejajarannya hanyalah 31 peratus.