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For an associate professor, you're not so good with explaining concepts. What you need is an example of genetic variance in a population of sheep and an example of environmental variance, that fits with ordinary reality. As the influence of environmental variance approaches zero, the additional nuance of the environment's influence on genetic variation is insignificant.
Apparently there is nobody on slashdot with any experience with the ethical requirements of doing psychological studies. Psychology is just not STEM-y enough, maybe.