General Discussion
In reply to the discussion: Google Fires Engineer Who Wrote Memo Questioning Women in Tech [View all]Adrahil
(13,340 posts)Is the study of how genes are turned on and off. That includes environmental factors for sure, and some recent evidence that use factors in early age drive epigenetics too, which may, for example, account for the phenomena many call "wiring the brain." In utero hormonal (the mother's hormones) factors can be involved, as well as post-natal intellectual stimulation. This appears to be part of the body organizing itself to suit what it thinks might be the competitive environment.
This area of research is still in its infancy. The wikipedia article gives an overview. The alleles involved in epigenesis are sometimes heritable. The expression is not necessarily.
My main point here is that early life experiences can express themselves in biological ways.