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Originally Posted by sapiens
Heritability estimates of intelligence range from 0.4 to 0.8 (on a scale from 0 to l). So, I wouldn't say "almost completely", but I do agree with your point generally. Intelligence as measured by an IQ test (probably the WAIS or WISC) is quite heritable, especially comparing it to measures of other psychological constructs. Intelligence as measured by an IQ test also predicts a great deal WITHIN western cultures.
What references are you using to support your argument about the heritabilities of morals and values?
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The identical twin study in question was .86 raised together, and .76 raised apart, while fraternal twins raised together were a .57 (I think) and I have a thing for twin studies in this sort of thing. Interestingly a person taking the same test twice yielded a .87 on average.
As for morals and values, I don't think anyone has studied many moral traits specifically, what I think is that our moral codes and values are based on our genetically determined instincts.
I'd have to dig up the references but lets take incest. Incest between brother/sister or family as a whole is frowned upon in just about every culture. When it has happened it becomes a historical anomaly and is always associated with royalty not the commoners. There is an apparent developmental aversion to sex with children you grow up with in constant contact, and when people in modern society tend to break this 'taboo' they were almost always raised apart. This would indicate this is an instinct. I can go into this more if needed.