Well from what I understand in my genetics course is that 1) many traits are multifactorial, those that arent or rather a multitude fo traits that combine together to form a clinical picture are associations and these go on to syndromes in the case of defects. Syndromes are genetic however their cause is multifactorial. Much like IQ has a genetic range, most people will land in the average and I mean the VAST majority. Those that dont have either a medical issue or alternatively a gift. If you reach your genetic potential for IQ that is the enviormental factors as well as factors of your development matter. However there is marked variation between populations that cna be seen by country averages, the result is that we can then extrapolate racial differences as well as well as differences in "styles" of thought through other tests etc. Its not brutally deterministic but there is a reason country X looks like it does and country Z looks the way it does. Most often it is due to the peope inside the country, rarely is it due to people outside the country. (This has been recently shifted as well).
Essentially genes matter, there will be differences, and basically the racial IQ debate is somewhat pointless since it does exist, however what matters is rather now the science of basically populations.
