On Nov 20, 2007, at 2:40 PM, Miles Jackson wrote:
> Based on twin and adoption studies, the heritability ratio
> for IQ performance is .40 to .60, meaning about half of the
> variation in
> IQ scores can be attributed to genetic variation.
Wait a minute. This says something about genetic composition and performance on IQ tests - specifically, people with identical chromosomes perform similarly, but well short of identically, on IQ tests. But what does it tell us about inheritance? That's a parent- child relation, not a sib-sib relation. What's the correlation between parental and child IQs?
Doug