Is IQ solely determined by genes?
A. No. Consider, for example, the need for micronutrient supplementation. For example, here in America, manufacturers have been adding iodine to salt and iron to flour since before WWII to combat medical syndromes (such as cretinism) that lower IQ. In poor countries around the world, hundreds of millions of children still suffer cognitively from lack of iodine and iron. Of course, this relatively cheap step for raising the IQs of the poor in Third World countries is rarely discussed, because the whole topic of IQ is so fraught with the chance of getting Watsoned out of your job.