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But how do you know that it was genetics and not some other factor that has led people like that to be like that? Or maybe a combination of things?

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This is basically the old nature vs. nurture thing. So the answer is similar - twin studies etc. Based on what I know (which is not much - I do not claim to be an expert) I would say that there is undeniable evidence that IQ is in fact strongly affected by genetics.

the question is also how much you rely on IQ as a measure. I found regarding nature vs. nurture, both camps have some good arguments ..

btw, I found the wikipedia article on the topic interesting: http://en.wikipedia.org/wiki/Heritability_of_IQ

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