Melanin clearly has a strong genetic component, as do other physical features that correlate with melanin. We want to know if it correlates with any interesting genetic differences.
A priori unlikely - skin colour is strongly selected for just on its own - near the equator you need melanin for protection from the sun, in high latitudes you need a lack of it to get Vitamin D - so Africans have lots of the stuff despite having the widest genetic variance per area of all humans. (That linked paper uses this fact to support their assertion that east Africa is where humans come from - it's a standard expectation that variance is greatest near the origin).
"Race" is a magical category that does not carve the gene pool at its joints. It's a social categorisation pretending to be a genetic one. e.g. Anyone who regards "negro" as a genetic grouping, on a par with Ashkenazim or Icelanders, has just invoked a magical category and needs to be led gently through charts of genetic variance per area.
When measuring effects of melanin, did they measure Indians as well?
"Race" is a magical category that does not carve the gene pool at its joints. It's a social categorisation pretending to be a genetic one.
Aren't clams that race is not genetic just plain silly?
Please remember to have no heroes or villains, but this just looks plain bad to be honest. I'm lowering my estimation of the quality of Stephen J. Gould's work in this area.
USA today:
Haha. Humans.
The paper itself: