I’m a neuroethologist working on learning and memory in honeybees. Something fascinating I’ve found is that the brain’s of both  “higher” mammals and insects such as bees seems to process information, multimodal information following the very same principles. So comparing a 1mm^3 and a 1500cm^3 brain and they reach the same algorithms via convergent evolution means that intelligence is potentially reachable throughout many convergent ways. Therefore, despite I agree in which intelligence is heavily influenced by genetics, it should not be a single genetic background having an intelligence advantage, specially among individuals of the same primate species where geneticist agree in non significant differences among groups of people, what is more the concept of race has none, zero, nada, genetic basis… therefore, any IQ difference should be historical, sociological… how one group has stepped over the head of the other to gain their resources, their time and working efforts is perhaps where the advantages lie.