The power of genetics

And no, I wouldn’t have thought the effect was measurable. Wrong again.

From the results presented here it is clear that there has been a slow but steady decline in the frequency of certain variants in the Icelandic gene pool that are associated with educational attainment. It is also clear that education attained does not explain all of the effect. Hence, it seems that the effect is caused by a certain capacity to acquire education that is not always realized.

Selection against variants in the genome associated with educational attainment. PNAS.