Gifted Issues Discussion homepage Forums GT Research IQ 80% heredity, according to Netherlands research

Dr. Posthuma has led two large-scale genetic studies resulting in the discovery of nearly 1,000 individual genes associated with intelligence. She’s also the lead author of two innovative statistical tools for gene-set analyses and post-genome-wide association studies annotation.
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What do you mean when you say intelligence is about 80 percent heritable?
That means the reasons that random pairs of individuals, drawn from the population, differ in their intelligence is 80 percent due to differences in their genetic makeup.
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And for 20 percent it is because there are differences in some kind of environmental factor.
...that’s something that we have known for more than a century.