[ExI] IQ and beauty

[BillK]

On 14 September 2015 at 18:19, PJ Manney wrote:
> When it comes to intelligence, it's the mother's genes that count in boys.
> They've only got one X chromosome which expresses intelligence. That's why
> you sometimes see the sons of the wealthy and powerful are as dumb as a sack
> of hammers, if dear old dad only married for beauty.
>


Possibly it is because males having only one X chromosome means that
males have greater variability in many gene expressions than females.
i.e. Although averages may be roughly equal, males have more high IQ
outliers and more low IQ outliers than females. This applies to other
traits as well.

<http://www.ncbi.nlm.nih.gov/pubmed/19031491>
Greater intrasex phenotype variability in males than in females is a
fundamental aspect of the gender differences in humans.
Lehre AC1, Lehre KP, Laake P, Danbolt NC.
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BillK