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Haplogroup R1
Haplogroup R1, or haplogroup R-M173, is a Y-chromosome DNA haplogroup, a subgroup of haplogroup R, associated with the M173 mutation. It is dominated in modern populations by two Eurasian clades, haplogroup R1a and haplogroup R1b, which together are found all over Eurasia except in Southeast Asia. However, other types of haplogroup R1, less well-known and undefined so far by any identified SNP, and therefore referred to collectively simply as R-M173
*, have been reported in the Americas and all over Asia and Oceania.
==Origins==
The origins of haplogroup R1 remain unclear. Haplogroup R is part of the family of haplogroup P-M45, and a sibling clade, therefore, of haplogroup Q-M242, which is common in the Americas and Eurasia. In Eurasia, Q-M242's geography includes eastern areas such as Siberia.
Based on its ancestral lineages, an inferred origin for haplogroup R1 is somewhere east of West Asia. For example, believes the evidence "suggests that southern and western Asia might be the source of this haplogroup" and that "given the geographic spread and STR diversities of sister clades R1 and R2, the latter of which is restricted to India, Pakistan, Iran, and southern central Asia, it is possible that southern and western Asia were the source for R1 and R1a differentiation." felt in their review of the literature, that the case for South Asian origins is strongest, with the Central Asian origin argued by being also worthy of consideration.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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