I’d be curious to get to the heart of why we believe heritability in behavior is due to genetic changes. It’s way more likely to be due to mimetic changes.

in terse, behaviour is dependent on neural activity; neural activity is dependent on expressivity, and penetrance of genetic constituency.

https://en.wikipedia.org/wiki/Behavioural_genetics

https://assets.cambridge.org/97811084/87979/frontmatter/9781... [PDF]