Haplogroup O (Y-DNA)
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In human genetics, Haplogroup O (M175) is a Y-chromosome DNA haplogroup.
This haplogroup appears in 80-90% of all human males in East and Southeast Asia, and it is almost exclusive to that region: M175 is almost nonexistent in Western and Northern Asia and is completely absent from Europe and Africa, although certain clades of Haplogroup O do achieve significant frequencies among some tribal populations of South Asia and some Turkic-speaking populations of Central Asia.
Haplogroup O is a descendant haplogroup of haplogroup K, and is believed to have first appeared in Siberia approximately 35,000 years ago. Haplogroup O shares a node in the phylogenetic tree of human Y-chromosomes with Haplogroup N, which is common throughout Northern Eurasia. In addition, Paragroup NO*, the overarching group of Y-chromosomes of which Haplogroup N and Haplogroup O are each an extended subset, is found at a low frequency among various East Asian populations, particularly the Japanese.
Among the subbranches of haplogroup O is haplogroup O3.
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