Editing Openai/69177fbb-14c4-800f-bc57-ccb5a1d88c95 (section)

=== What we know from twin and family studies: ===
* Autism is highly heritable.
* But the heritability is polygenic, meaning there are hundreds of small-effect variants, plus occasional large-effect mutations.
* Those variants combine in different configurations in different individuals—even within the same family.

That leads to:
* one sibling having a profile that looks like classic Asperger’s
* another having more language delay
* another having social traits but not enough to be diagnosed
* another being neurotypical but with high systemizing tendencies

It’s variation in degree, not a Mendelian particulate subtype.
That’s why the “Asperger’s subtype” rarely clusters cleanly generationally.

This part is well grounded scientifically.