"Do you have a source for this that isn't, um, from the Simpsons?"
My Simpsons reference was meant to be a colorful analogy, and not a "source." Sheesh.
The source for my statement was journal article I read a few months back. I can't seem to track it down online, but here's a blog that summarizes the studies:
this so called 'new hypothesis' has been around for more than 50 years. It was just not written about because people couldn't accept the consequences have accepting that it was a possibility.
There are more genes related to intelligence on the X chromosome than on just the X and Y chromosomes. There are still 22 other pairs of chromosomes, which in offspring, are a mishmash of the father and mother's chromosomes. Genes on these chromosomes have been experimentally linked with intelligence (eg, http://genepi.qimr.edu.au/contents/p/staff/CV453.pdf)
Plus, there are sex differences in intelligence; there are more male dullards and geniuses. Men score higher on visuospatial ability, and women on verbal ability. Given that these are distinctly sex related, their genesis lies in differences between the X and Y chromosomes.
My Simpsons reference was meant to be a colorful analogy, and not a "source." Sheesh.
The source for my statement was journal article I read a few months back. I can't seem to track it down online, but here's a blog that summarizes the studies:
http://flatrock.org.nz/topics/men/thank_mom_for_brains.htm
Like I said, the jury is still out on this. This is a relatively new hypothesis, and not a long-standing theory.