https://www.annualreviews.org/doi/abs/10.1146/annurev-genet-110711-155514
Here the author states that an evolutionary approach is the way to understand what genes underlie aggression. Why? because aggression is a fitness promoting trait and so genes that are increasing in frequency are likely aggression genes. One way to look at that is that an allele called an "ancestral allele" is unlikely to promote aggressive behavior.
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