It’s interesting how you keep bringing up the adoption study, especially since the people who conducted it actually stated that it was evidence for a wholly environmental theory of intelligence. The people who claim it shows a genetic influence are, yep, Jensen and Lynn again. Maybe it’s me, but for such an obviously popular and correct theory, it’s strange how so many articles are written by just the same few bigots over and over…
Anyway, some more quotes I think you'll find interesting:
"Race is a social construction, not a biological construct, and studies currently indicating alleged genetic bases of racial differences in intelligence fail to make their point even for these social defined groups." -
http://www.apa.org/journals/releases/amp60146.pdf"The academic and occupational successes of Asian Americans have caused many people to presume Asian Americans have higher-than-average IQs. However, most studies show no difference between the average IQ of Asian Americans and that of the general population. Some studies of Asians in Asia have found a 3 to 7 point IQ difference between Asians and whites, in favor of Asians, but other studies have found no significant differences."
"It is interesting to note, however, that the gap between the whites and the blacks have reduced by one third in the last 30 years and many believe that the average IQ of the two populations will gradually converge, resulting in minimal difference between them – due to the Flynn effect, which states that IQ scores from all nations are slowly increasing over time due to improved environmental conditions [...] Many critics of the genetic view simply argue that the studies which show racial differences are flawed or inconclusive. The fact that the gap between black and whites is decreasing seems to support their views. In fact, they offer evidence to show that African-Americans have excelled in almost every enriched environment they have been placed in (and which they were previously barred from) and that this distinction has been achieved in only a few decades, with improved but still not equal opportunity [...] Studies have shown that a student’s ethnicity did make a difference in the teacher’s decisions for referrals for gifted and talented educational programmes." -
http://www.aboutintelligence.co.uk/the-controversy-race-intelligence.html"It is important to note that neither IQ, future academic performance, nor life success can be predicted from an individual's race or ethnicity." -
http://social.jrank.org/pages/529/Racial-Differences-Standardized-Tests-Race.html"These differences are substantial, there are much larger differences between people within each group than between the means of the groups. This large variability within groups means that a person’s racial or ethnic identification cannot be used to infer his or her intelligence. "