Distribution
Haplogroup O-P31 is notable for the peculiarities of its geographical distribution. Like all clades of Haplogroup O-M175, Haplogroup O-P31 is found only among the males of modern Eastern Eurasian populations. However, Haplogroup O-P31 is generally found only among certain populations, such as the Austroasiatic peoples of India, Bangladesh and Southeast Asia, the Nicobarese of the Nicobar Islands in the Indian Ocean, and the Koreans, Japanese, and southern Tungusic peoples in China.
Besides its widespread and patchy distribution, Haplogroup O-P31 is also notable for the fact that it can be divided into two major subclades that show almost completely disjunct distribution. One of these subclades, Haplogroup O-M95, is found among some (mostly tribal) populations of South and Southeast Asia, as well as among the Khmers of Cambodia and the Balinese of Indonesia. The other major subclade, Haplogroup O-M176, is found almost exclusively among the Japanese, Koreans, and Manchurians.
Read more about this topic: Haplogroup O2 (Y-DNA)
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