Haplogroup R1 is a major lineage in human genetics, primarily associated with the Y-chromosome. It is believed to have originated in Central Asia around 20,000 to 30,000 years ago. This haplogroup is prevalent in many populations across Europe, parts of Asia, and the Americas, reflecting historical migrations and expansions. Within haplogroup R1, there are several subclades, including R1a and R1b, which have distinct geographic distributions. R1a is commonly found in Eastern Europe and South Asia, while R1b is more prevalent in Western Europe. These subclades help researchers trace human ancestry and migration patterns over millennia.