The genetic aspect of intelligence has been continuously studied since we discovered DNA (https://scholar.google.com/scholar?hl=en&as_sdt=0%2C32&q=genetic+intelligence). Deary, Johnson, and Houlihan (2009) have an entire section in their paper discussing complications in studying genetic contributions to intelligence. It's definitely worth a read, it's open-source (I think, I am on a network with large access to academic publications), and kind of works at what you're interested in.