https://pubmed.ncbi.nlm.nih.gov/31950512/?from_term=aggression+trait%2C+genes&from_filter=years.2020-2020&from_pos=4
Since studies seem to find over 50% heritability of aggression trait, it's hard to believe that anyone ever thought aggression trait was not inherited but just environmentally caused.
But environment contributes. Here in co twins, females who were aggressive seemed to increase their male co-twins aggressiveness, but aggressive male co-twins seemed to cause less aggressiveness in their female co-twin.
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