DocRay,

Since you appear to know just a smidgeon about genetics, is it a correct assessment for me to theorize that long term (hundreds or thousands of years) exposure in a given environment will actually cause the human body to create an inherant gene that will allow them to perform better in that environment?
And ,wouldn't it be logical to assume that the genes which provide that to one, would be passed on to their posterity, even if they were to temporarily leave the previous environment that caused the genetic change to begin with?

Just curious as to your thought on that theory.