All of these compounded over hundreds and possibly thousands of years could have possibly affected the IQ of the Jewish population. There is one problem with th

All of these compounded over hundreds and possibly thousands of years could have possibly affected the IQ of the Jewish population. There is one problem with this idea, in that most of that requires an elevated IQ to begin with. I don't understand why this requires an elevated IQ to start with. If we suppose that IQ is partly genetic, and therefore subject to random mutations, and if we further suppose that the smarter offspring have better opportunities to mate, then wouldn't that be enough to end up with a smarter group of people over time?