[NoImmatureAdHom]

That is not, in fact, what "thousands of peer reviewed research articles" state. You might be confusing the % of variance we can predict from genetics (e.g., knowing your ATGCATAGCCGTAG code), which at present is maybe 4%(?), with what we can show is due to heritability (70-80%). We didn't even know about DNA when people started measuring this kind of stuff with twin studies in the early 20th century.

So, to reiterate because I'm realizing that para wasn't so clear: guessing how smart you are based on your genetic code is something we're only just learning how to do. We're getting better at it though. Estimating how smart you are based on how smart your parents are is a totally different game that we've been playing for a century.