Handling and temperament

If we have two genetically identical rats, but I handle mine gently, playfully, and regularly, and yours are handled infrequently, and when they are they’re handled purposefully to do temperament testing such as scruffing, or exposure to loud noises etc, the rats remain genetically the same, but the expressions of those genes will differ. Saying one is showing “true genetic temperament” and one is “trust trained” or “a ticking time bomb” is totally misunderstanding that both ways of raising a rat involve the environment that they’re being raised in working with the genetics to result in the end product.