An almost example here, with the valence reversed, is human intelligence in general at both the low and high end, since the trait is likely to be gaussian due to the additivity of genome effects + randomness in what genes you get.
An almost example here, with the valence reversed, is human intelligence in general at both the low and high end, since the trait is likely to be gaussian due to the additivity of genome effects + randomness in what genes you get.