human biology - Is intelligence (or mental ability) genetically transferred (inherited characteristic) from the parent to the offspring or is it an acquired trait?

The question is simple- whether our mental ability i.e. ability to acquire and store knowledge and comprehend and analyse the stored bits, an inherited trait (i.e. genetically transmitted from the parent to the offspring) or is it an acquired trait (depends on environmental, social factors)?

P.S. - Please attach the link of any reference/research (if any) with your answer.