There are likely many hundreds or more of contributing alleles according to one paper I read in uni. How individual differences manifest genetically is stultifyingly complex. We still don't even have a unifying theory of what intelligence is, or even consciousness - much less "how make smarterer". It's before early days, we're still banging rocks together. Scientists know approximately dick about intelligence.

But on the plus side, the people capable of paying for this bullshit are going to have significantly higher chance of proper nutrition for their kids, access to good education, and ability to avoid environmental toxins, so they just have to compare their "handpicked sperm" to the population as a whole and they'll show great results.

Yeah this is an obvious scam lol.

(It's not about IQ specifically, but to anyone interested in how many different environment factors play a role in human behavior/outcomes, Behave by Robert Sapolsky is an excellent overview of research in a broad variety of fields. It's definitely not a light read, but it doesn't assume too much prior knowledge, and is one of my favorite books on what makes us tick.)

@HelixDab2 @sue_me_please I'd go a step further and say it doesn't work. It's an inherently flawed concept that you can reduce human thought, skill, ability, and behaviour to a number and then rank people by it. The legacy of general intelligence itself is that of people assuming it exists and seeking to justify their assumptions.