Life can be really funny. When I was in college I was incorrigibly curious and I asked a Korean American friend if his ear wax was dry (I’d read that East Asians had dry ear wax once) and his response was, “Isn’t everybody’s?” When it comes to interpersonal differences there are many things we take for granted and extrapolate to others that aren’t necessarily true.1 Nick Wade in The New York Times has an interesting write up about the genetics of the ear wax phenotype. While the populations of Europe and Africa have wet ear wax, those of East Asia have dry ear wax. Other populations are somewhere in between. Nature Genetics has the original paper (don’t be surprised if the link takes a while to load). Here are the worldwide distribution of the alleles:
The trend is pretty clear, modal in Northeast Asia and decreasing everywhere else. These figures ...
