Blue eyes

The origin of Tibetan people is a subject of hard study.  Some suggest that the majority of Tibetan gene pool may have diverged from the Han around 3,000 years ago. However, there are evidences of much earlier human inhabitation of Tibet. The distribution of Haplogroup D-M174 is found among all the populations of Central Asia and Northeast Asia south of Russian border, although generally at a low frequency of 2% or less. A dramatic spike in the frequency of D-M174 occurs as one approach the Qinghai-Tibetan Plateau of western China. D-M174 is also found at high frequencies in Japanese people but it fades into low frequencies in the Han populated Mainland China between Japan and Tibet.

This picture of a Tibetan boy is a one of twin brothers; strangely, his twin brother has dark brown eyes, in stead blue eyes.

A recent Danish science study suggest blue-eyed humans have a single, common ancestor, perhaps this Tibetan boy and the Geisha in Japan are relatives?