Lets take as examples a typical Norwegian and a typical Nigerian.
In terms of human anatonomy the outer differences are more obvious e.g. (on average)
- White skin vs dark skin
- Pointy nose vs broad nose
- Thin lips vs thicker lips
- Straight hair vs tight curly hair
- Different skull shape
- Height differences
- Different colour eyes or eyelids.
In fact there is almost a difference in every external organ.
There are also some invisible differences such as propensity to sickle cell disease.
But what I hear less about is the differences (in general) between internal organs between populations. Some people even suggest that differences are only "skin deep" between human populations. Which I think goes against evolutionary theory. As why would natural selection stop at skin level? Also, there is a lot of research into skeletal differences but that's easier to do since we can look at a skeletons.
Therefor it seems fairly logical to assume that there would be fairly apparent differences in internal organs between these populations. (I hesitate to use the word 'races') i.e. as apparant as different hair types, or different nose shapes.
I don't mean that one population will have 3 kidneys for example, but I would expect that there would be an obvious shape or size difference between most, if not all internal organs, just as there is a shape, colour or size difference between most external organs.
Is there some research done on this, e.g. a catalogue of differences in internal organs morphology between different populations? Or is it taboo to even ask such questions perhaps?
Edit: One might say, "how would anyone know? Or care?" But, for example, a heart surgeon might find they need different sized instruments dealing with different people. Or surgeons from different continents might compare notes on anatomy. And anatomy textbooks based on just one population might not be representative. Surgeries working on one "race" might not work on others. e.g. if the heart wall was thinner or the colon was longer.