system
Given the following post, respond as if you're commenting on Reddit:
human
Is there a genetic difference between the races?

I'm arguing with someone on another subreddit and we've pretty much exhausted google. So I'd appreciate some expert help. Thanks!

* Is there a significant genetic difference between the races?
* Is one race more intelligent than other races?
gpt
There are genetic differences between races, but most of those differences are relatively insignificant.  Human populations are actually relatively low in diversity, compared to other animal species.  It's been speculated that the human population was bottlenecked down to as few as maybe 5,000 people only about 50,000 years ago by the Toba supervolcano eruption.  Two mice species that look very similar to each other (to our eyes) can actually be more distantly related than humans and gorillas.  And they can successfully interbreed.  

So compared to that, our racial differences are pretty much trivial.  Also, our ideas about race actually correspond pretty poorly to the actual genetic data.  The most egregious example of this is just lumping african populations together.  There is more genetic diversity contained in african populations than there is in the rest of the world combined.  An average swede is more closely related to the average mongolian than two africans that may live in the same city.

As for intelligence, the current thinking from genetic association studies and twin studies is that 40-50% of intelligence is determined by your genetics.  The rest is environment.  However, given the degree of genetic diversity in place, you can't make a blanket statement that "africans are dumber than europeans".  Africa contains so much genetic diversity, it will contain individuals that are "genetically" much smarter than europeans, as well as individuals that are less smart.  The distributions of those and averages may be different, but it's hard to define the relative contributions of genetics for someone who grows up as a sub saharan tribesman and someone who grows up in sweden with free education.  There is very little in common between their two educations, so it's very hard to make an IQ test that encompasses everything they both are good at.