FACT BREAK.
First, My thanks for previous Factual posts to...
Exxcon
US Conservative
Radcen
Turtle Dude
This addressed to SouthernDemocrat et al.
Race differences in average IQ are largely genetic
Published on April 26, 2005 at 5:29 PM
News-Medical.net
"...Race differences show up by 3 years of age, even AFTER matching on maternal education and other variables," said Rushton. "Therefore they CANNOT be due to poor education since this has not yet begun to exert an effect. That's why Jensen and I looked at the genetic hypothesis in detail. We examined 10 categories of evidence."
1. The Worldwide Pattern of IQ Scores. East Asians average higher on IQ tests than Whites, both in the U. S. and in Asia, even though IQ tests were developed for use in the Euro-American culture.
Around the world, the average IQ for East Asians centers around 106; for Whites, about 100; and for Blacks about 85 in the U.S. and 70 in sub-Saharan Africa.
2. Race Differences are Most Pronounced on Tests that Best Measure the General Intelligence Factor (g). Black-White differences, for example, are larger on the Backward Digit Span test than on the less g loaded Forward Digit Span test.
3. The Gene-Environment Architecture of IQ is the Same in all Races, and Race Differences are Most Pronounced on More Heritable Abilities. Studies of Black, White, and East Asian twins, for example, show the heritability of IQ is 50% or higher in all races.
4. Brain Size Differences. Studies using magnetic resonance imaging (MRI) find a correlation of brain size with IQ of about 0.40. Larger brains contain more neurons and synapses and process information faster. Race differences in brain size are present at birth. By adulthood, East Asians average 1 cubic inch more cranial capacity than Whites who average 5 cubic inches more than Blacks.
5. Trans-Racial Adoption Studies. Race differences in IQ Remain following adoption by White middle class parents.
East Asians grow to average higher IQs than Whites while Blacks score lower.
The Minnesota Trans-Racial Adoption Study followed children to age 17 and found race differences were even greater than at age 7: White children, 106; Mixed-Race children, 99; and Black children, 89.
[...And 5 More at Link above]