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I agree with you. One misconception that I have been fighting with myself is the notion of genes being a mold or something static that you are born with from which you then grow change and develop, never to look back besides to consider "where you  once came from."  The model you have proposed (the interaction between genes and environment being dynamic and interactive) seems to be much more useful and makes more sense.  The effect of nature/nurture on behavior seems like the perfect place to implement another "loop model."