There are genetic differences between men and women that impact personality. I agree. As for geographic populations there's no reason to assume that alleles impact intelligence are unevenly distributed across geographic populations when you consider that there is wide variation in mental traits even within families. What we know about intelligence suggests that the variation in the genes that influence it are continuous across populations.
I ment that, in particular considering the wide variation in mental traits, if a person of one group differs from a person of another group then the genetic variable (however large or small) is likely to be there just as it is when comparing two individuals from within a given group is. That there is a 'continuous' influence of our genes across populations tell us very little about the differences we consistently observe between such populations (and individuals).
We don't all have the same intellect but there's no basis for claiming that there is a limit to which a certain population can learn and IQ tests can't determine that because they aren't based on the ability to learn
Well yes and no. Psychometric measurements of one's cognitive abilities, while not interchangable with certainty or absolute destiny, are consistently showed to have a predictive battering-average that simply dwarfs many (perhaps even most) of behavioural predictive yardsticks used by politicians, philosophers, sociologists, anthropologists, military strategists et al. In all humbleness, this tells us there is
some probability to suspect at least partial/greater than zero influence of heredity and nature onto mental faculties within as well as between the continously observed and recorded clustering differences of human groups and variations thereof.
The heart of the matter is that the aptitude for learning and understanding is tied to ones ability to learn and apply. We can only, in our lifetime, with all the lessons and teachings thrown at us, increase our perfomance level on such tests by a small degree at best. I.e we can from our basic uneducated state, through tailored education toward such tests, learn to perfom a little bit better on them. But we're all in the same boat on this note and the same or similar difference between our perfomances still remain.
Not even within comparison of financial brackets is there equality of intelligence. In my experience, one reason some folks do
not want to even consider that it has
something to do with the hereditary part of intelligence (which is consistently demonstrated in mainstream science as an "as
much or often larger part than enviorment") must be because they react emotionally or ideologically against such a proposition, as I've come to understand it. It might not always be the case, of course, but in my experience that has indeed been the case, though I withhold judgement of your reason for believing as you do with respect to that. The fact that we can with enough imagination correlate anything to anything does not nullify or disqualify the value of correlations in observing and explaining probabilities of what the causation might be. While it can't be noted on enough that there's no single gene or base-pair that is predominantely responsible for ones IQ, unlike gender differences or thereof. We're looking at cognitive abilities, and yes we do have a lot of them, several which relate either directly or indirectly to how well we might perform in society in general, in interactions et al and specifically when dealing with complexities, tests, challenges, related competition and so forth (like language, creativity, attention/rapid learning/memory, comprehension of complex concepts/multi-hypothesizing simultaneously, logical/mathematical/pattern abilities). The, by far, best 'predictor' for success in the given areas, that require a high degree of acuteness in any of the formentioned attributes, is intelligence, and IQ predict those in turn quite consistently. I'd recommend you to read "
Intelligence: A Very Short Introduction" by Ian Deary and the paper "
Variability and stability in cognitive abilities are largely genetic later in life" (Lichtenstein, Plomin R, McClearn, Pedersen).