R1a1a

R1a1a is a subclade of the Y-chromosome haplogroup R1a. Y-chromosome haplogroups are genetic markers used to trace paternal lineage through the Y chromosome, which is passed down from father to son. Haplogroup R1a is one of the most widespread Y-DNA haplogroups, found predominantly in Eastern Europe and Central Asia, and parts of South Asia.

The R1a1a subclade is further defined by specific single nucleotide polymorphisms (SNPs) on the Y chromosome, which distinguish it from other R1a subclades. Its geographic distribution and frequency vary, but it is a significant component of the paternal ancestry in many populations. Studies have indicated that R1a1a likely originated in a region of Eurasia, and its subsequent spread is associated with various historical migrations and population movements.

Researchers analyze the presence and frequency of R1a1a in different populations to infer ancestral connections and reconstruct migration patterns over millennia. Its presence and distribution are topics of ongoing research in population genetics and human history, offering insights into the ancient movements of peoples across continents.