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It says a lot about it. For instance: "She examined the IQs of Black and mixed-
race children averaging 8.5 years of age who were adopted
by middle-class families who were either Black or White.
The children who were of half-European origin had virtually the same average IQ as the children who were of
exclusively Black origin. Hence European genes were of
no advantage to this group of 'Blacks.' Children (both
Black and mixed-race) adopted by White families had IQs
13 points higher on average than those adopted by Black
families, indicating that there were marked differences in
the environments of Black and White families relevant to
socialization for IQ; indeed, the differences were large
enough to account for virtually the entire Black–White gap
in IQ at the time of the study." It says less about Jews in particular, which I'd guess is because of a lack of data. There's not a heck of a lot of Jews up for adoption, relative to blacks. But it does note: "It is important to note that even at the highest estimates we have of Jewish IQ, Jewish accomplishment exceeds what would be predicted on the basis of IQ alone.
Nisbett (2009) has argued that the numbers of Jewish Ivy
Leaguers, professors at elite colleges, Supreme Court
clerks, and Nobel Prize winners are greater than one would
expect even if average Jewish IQ were 115. He has also
noted that remarkable as the superior achievement of Jews
is, the achievement difference between Jews and non-Jews
is far less extreme than differences between groups in many
other comparisons that cannot be explained on purely genetic grounds, such as the achievements of the Italians
versus the English in the 15th century, of the English
versus the Italians after the 18th century, of Arabs versus
Europeans in the 8th century, of Europeans versus Arabs
after the 14th century, and of New Englanders versus
Southerners throughout American history." While it is certainly plausible that there is some big genetic influence on intelligence due to ethnicity, like there is in athletics, we have yet to find convincing evidence of it. |