NPA personality theory
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Re: Aggression twin study in Netherlands
Identical genes would have to equal the same NPA type. There's plenty of room for other differences in personality within the same NPA type and even between identical twins. Identical (monozygotic) twins can even have obvious physical differences and I believe this is conferred by different levels of expressivity of the same genes.
Regarding identical twins I suppose it would be possible for one twin to have a phenocopy or behavioural inversion the other didn't have, e.g. an A- phenocopy or pronounced pseudonarcissistic tendencies.