A Haplotype on Chromosome 2 That Contains the EDAR Gene

Multiple Choice

A haplotype on Chromosome 2 that contains the EDAR gene is found at a frequency of 90% in the Han Chinese population but is essentially absent in other populations. Which of the following pieces of evidence suggested that this haplotype had a recent origin?

A) China was thought to be very hot and humid at the time the haplotype arose
B) The EDAR gene is thought to increase sweating
C) The EDAR gene has pleiotropic effects
D) The haplotype is long