In studying a gene that drives cell growth, Project ENIGMA scientists found a variant that boosted gene expression levels (shown as colored dots), which also enlarged the brain's memory centers (shaded in green). CREDIT: UCLA Laboratory of Neuro Imaging
Specific Genes Linked To Big Brains and Intelligence -- Live Science
Brain size and smarts are, to some extent, genetic — and now, a team of more than 200 researchers has uncovered specific genes that are linked to both brain volume and IQ.
Though scientists have suggested bigger brains are "smarter," this study is the strongest case yet for a genetic connection to brain size and to IQ. Of course, brain size is not 100 percent correlated with a person's intelligence, and other factors, including connections between brain cells and even a person's experiences, play roles.
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My Comment: Hmmmm .... bigger brain .... greater intelligence.