The R1a lineage is believed to have originated in the Eurasian Steppes north of the
Black and Caspian Seas. This lineage is believed to have originated in a population of the
Kurgan culture, known for the domestication of the horse (approximately 3000 B.C.E.). These people
were also believed to be the first speakers of the Indo-European language group. This lineage
is currently found in central and western Asia, India, and in Slavic populations of Eastern Europe.
R1b Haplogroup R1b is the most common haplogroup in European populations. It is believed to have
expanded throughout Europe as humans re-colonized after the last glacial maximum 10-12 thousand years
ago. This lineage is also the haplogroup containing the Atlantic modal haplotype.
This lineage originated in the northern portion of the Fertile Crescent where it later spread throughout central Asia, the Mediterranean, and south into India. As with other populations with Mediterranean ancestry this lineage is found within Jewish populations.