5 ms·

ADHD is certainly not Mendelian. There are likely multiple genes involved probably around specific pathways. https://www.nature.com/articles/s41380-018-0070-0

• lazide 4y ago
  Seems like it’s about 75% heritable (if one or both parents have it), definitely not clearly recessive.
  • astrange 4y ago
    "Heritable" doesn't mean it's genetic. You exist in the same environment as your parents - literally you're born inside them.
    • sjg007 4y ago
      There's epigenetics. This is why we see differences with monozygotic twins.
      • astrange 4y ago
        That's if you started studying them right after birth maybe, but otherwise it's more likely one had more childhood lead exposure than the other or ate different diets, things like that. Air pollution in particular seems to be really really bad for all kinds of health.