Intelligence is not controlled by a single gene, but by several genes. This is known as the principle of dominance incomplete dominance
multiple genes
the Punnet Square

The answer is "Multiple Genes".

(Traits that are controlled by multiple genes and/or influenced by... are controlled not just by one gene, but rather, by multiple (often many) genes)

Multiple Genes

Explanation:

A gene has two or multiple alleles for any trait or character. There may be codominance, incomplete dominance, etc like Rh factor in blood group.

When a trait is under the influence of more than one gene it is controlled by multiple genes. Like Skin colour etc.

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these are the only ones that i know, i hope this , and good luck.

if you know your abc's you should be able to get your answer or just use google