I would be very surprised if high intelligence was anything other than the extreme edge of a normal distribution of the human population. For it to be anything other than this it would require people of high intelligence to be a sub-population that did not breed with the rest of humanity.
On the other hand - Chimps are significantly less intelligent than humans. So clearly, genetics play a role.
Of course genetics plays a role in intelligence (a very important role). In the case of chimps they are not part of the human population so they are not really relevant to any discussion about the genetics of human intelligence.