"Chance" is a colloquial term for a stastical principle. "Error" is a completely different principle...it's a function of the accuracy of your test, not the statistical distribution of your results. You would know this if you ever took a statistics class...
This is what I mean when I say you can't speak the language. So far, you've proven you can't define "heritability", "variance", "chance", "error", "mean", "regression"... you just keep getting funnier and funnier...