441: I read the actual article that news report is based on, and it doesn't really say what the *Independent* says it says. It's a casual review (that is, not what I'd call a scientific article, really) of the debate over the degree to which intelligence is genetically determined, and where such genetic material might be found. The part where it could be read to say that intelligence is located on the X chromosome actually says that there had been evidence put forward in the past that intelligence has a place on the Y chromosome, but the evidence is actually ambiguous and allows for an X-based interpretation as well.
A quick search for actual serious recent research on the topic came up nearly empty—there’s a 2014 study that basically concludes “it’s messy”, but it almost seems like it isn’t something that’s being actively worked on, or if it is it’s being discussed using words that I (who am admittedly coming at this from outside the field) don’t know to search research databases on.
TL;DR: It appears to me that the jury’s still out on that one, actually.