How is ASD passed on?

Could you please explain in simple terms how Autism Spectrum Disorder, or ASD, is typically transmitted from one generation to the next? Is it a purely genetic condition, or are there other factors at play? Are there any specific genes that have been identified as being associated with ASD? How do researchers determine the likelihood of a child developing ASD if one or both parents have the disorder? Are there any screening tests or early interventions available to help detect and manage ASD in young children?