The following is an excerpt.
An animal model of recent human evolution found that a single mutation produced several traits common in East Asian people, from thicker hair to denser sweat glands. They also modeled the spread of the gene mutation across Asia and North America, concluding that it most likely arose about 30,925 years ago in what is today central China.
Previous research identified the mutation as a strong candidate for positive selection. That is, evidence within the genetic code suggested the mutant gene conferred an evolutionary advantage, though what advantage was unclear.
View the original article here: Single Genetic Mutation Produced Thick Hair 30,000 Years Ago