[Noumenon72]

One common story that is told is that men have more variance in outcomes than women; regardless of whether men are taller, the very tallest and shortest individuals are both male. So if you select for the people with the most board memory, the most pattern recognition, the most patience, and whatever other weird traits, you could have entirely equal representation if you take the top 50% or the top 10%, but the top 0.1% could be all male.

[MengerSponge]

Men exhibit more variance in traits that are expressed on the X-chromosome, as they only have one of them.

Something as complicated as intelligence is not strongly tied to a single genetic marker, so while there may be some variance, it won't be nearly as broad as in something simpler (but still complicated), like height.