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R1a & all subclades

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Family Tree DNA's haplogroup description of R1a:
R1a - The R1a lineage is believed to have originated in the Eurasian Steppes north of the Black & Caspian Seas. This lineage is thought to descend from a population of the Kurgan culture, known for the domestication of the horse (circa 3000 B.C.E.). These people were also believed to be the first speakers of the Indo-European language group. This lineage is found in central & western Asia, India, and in Slavic populations of Europe. Member: The R1a Y-chromosome Haplogroup Project is an independent research project and receives no grant underwriting. Participants are responsible for the costs of their own tests. Information and data obtained from the R1a Y-chromosome Haplogroup Project must be attributed to the project, administrator, and Family Tree DNA as outlined in the Creative Commons License. Please notify administrator when using data for public or private research.Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 License.Counters

Very general guide to SNPs for R1a1a1:

R-L664/cts7083 R1a1a1a*
has 388=10, mostly British
R-Z283 R1a1a1b1
most project members are Z283+.  
R-Z282 R1a1a1b1a

R-M458 R1a1a1b1a1   This group is common to Poland/Germany/associated regions
R-L260 R1a1a1b1a1a*
385a=10 (mostly)
R-CTS11962 R1a1a1b1a1b

R-L1029* R1a1a1b1a1b1*    
R-Z280  R1a1a1b1a2   This group is generally central European, some eastern
R-Z92=z660=Z661 R1a1a1b1a2a*
Many Baltic
R-cts1211 R1a1a1b1a2b
R-P278 R1a1a1b1a2b1*
R-L784 R1a1a1b1a2b2*
R-cts3402 R1a1a1b1a2b3
R-L365 R1a1a1b1a2b3a
R-F2686* R1a1a1b1a2b3a1*
R-L366* R1a1a1b1a2b3b*
R-L1280* R1a1a1b1a2b3c*   385b=13 usually
R-Z284 R1a1a1b1a3   This group is generally Scandinavian/northwestern European
R-L448 R1a1a1b1a3a
Base Scandinavian
R-cts4179 R1a1a1b1a3a1
Base Scandinavian
R-L176.1* s179. R1a1a1b1a3a1a*
Scottish, Young Scandinavian  mostly: 459a/b=8/10, b=19,21
R-z288 R1a1a1b1a3b
Old Scandinavian
R-cts8401 R1a1a1b1a3b1
R-Z87,88 R1a1a1b1a3b1a*
R-cts8277 R1a1a1b1a3b2*
R-CTS4027 R1a1a1b1a3c*    
R-Z93 R1a1a1b2   This group is generally Asian and Eastern European
R-L342.2/S278.2, Z94 R1a1a1b2a
R-Z94=L342.2 R1a1a1b2a 
R-L657 R1a1a1b2a1
Most common to Indians, Arabs
R-Y7* R1a1a1b2a1a*
R-Y6* R1a1a1b2a1b*
R-Z2124 R1a1a1b2a2
R-Z2123* R1a1a1b2a2a*
Includes Bakshir
R-Z2122 R1a1a1b2a2b
R-F1345 R1a1a1b2a2b1
R-cts6/ash-lev R1a1a1b2a2b1a*
R-F2935 R1a1a1b2a2b1b*
R-Y57* R1a1a1b2a2b2*   there is a group of European folk who fall into this group