So you propose there may be a biological reason why Jewish and Asian populations score one standard deviation higher on IQ tests than those of European descent?
I propose that there may be a hereditary component involved. Or at least I think it would be interesting to do the actual research to find out. Even though I am neither Jewish nor Asian.
I think you're off on your numbers. My understanding is that Ashkenazi Jews score roughly 1/2 to one full SD higher, although Sephardic and other Jews are roughly average.
East Asians, or at least some nationalities in this group, score about 5 IQ points higher on average, not the 15 or so points of the SD.
I don't understand why any of this should be considered controversial. Various human groups vary over a multitude of traits. Why should intelligence be the only one evenly distributed?