Judge this joke

[FlameFlash]

You lost a dollar on that bet, didn't you?

Now if I could just remember that movie title...

[Hauldren Collider]

If heritability is greater than .5, then the majority of the variation seen in the trait is due to genetic factors. Heritability appears to be greater than .5, so it appears that the majority of the variation seen in the trait is due to genetic factors. My conclusion is basically definitional. If you want to argue over "not much of a role" and other poorly defined comparative terms, I'll go masturbate on my own, thanks.

It doesn't necessarily mean genetic factors. Lots of things are inherited from parents apart from genes. Experience is a big one. Intelligence is not only affected by genetics, there are lots of environmental factors. I'm not sure what the relative importance of them is, so I'm also not saying you are necessarily wrong.

However, if heritability is greater than .5 on something as thoroughly-measured as IQ, we can be extremely confident (basically certain) that there is really a significant inheritance effect.