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Haplogroup R1a1
Haplogroup R1a1, also referred to as haplogroup R-M17 or R-M198, is a Y-DNA haplogroup defining one of the most common human male lines found in modern Eurasia. It is defined by the SNP mutation M17, and is particularly common in a large region extending from South Asia and Southern Siberia to Central Europe and Scandinavia .
The R1a1 is the most common subclade within the family of the Y-DNA Haplogroup R1a, which share in common the M420 SNP mutation, and before the discovery of M420, R1a1 was itself referred to as R1a.
==Origin==
The modern distribution of R1a1 has two widely separated areas of high frequency, one in South Asia, and the other in Eastern Europe. The demographic reasons for this are the subject of on-going discussion and attention among population geneticists and genetic genealogists.
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