Like height and size, IQ also has identifiable genetic components.....Peer Reviewed links for your reading if you care to do so.
Genetic Variants Build a Smarter Brain
http://www.sciencemag.org/news/2012/...-smarter-brain
Genes don't just influence your IQ—they determine how well you do in school
http://www.sciencemag.org/news/2014/...-you-do-school
Gene Network Effects on Brain Microstructure and Intellectual Performance Identified in 472 Twins
http://www.jneurosci.org/content/32/25/8732
If IQ was 100% determined by Nurture/Environment then you would be (and I am not accusing you of this at all) laying the blame for those races and ethnicities not achieving as high on IQ tests on the cultures they come from/were raised in and that is (and dear lord I hate to use the word) "problematic" because all cultures value education, all cultures value knowledge and to say "It's 100% nurture/environment" is saying Native American cultures don't value wisdom, education, Black cultures don't value wisdom, education, Hispanic and Latino cultures don't value wisdom education and I don't for 1 second believe that, and I believe that you are not inferring that but you're not meaning to imply it, but this is the crux of the trouble when discussing IQ along with race and ethnicity.
It's by no means an open and shut case either way.


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