I doubt whether there will ever be discovered a “gay” or autism genetic marker because these conditions exist on a spectrum…it is not a binary issue like Down Syndrome, i.e., you either have it or you don’t.

No one is 100% gay or autistic, there is wide variability in the behaviors demonstrated.

Will they be able to assess for biological “risk” factors, perhaps. There are other more obvious epidemiological factors associated with autistic spectrum, such as family history. For example, if the father has ASD, there is a far increased chance for the child to have the disorder.

People choose to have abortions for a multitude of reasons, they always have. Some may be forgivable, some not, depending on your point of view.