Definition of Haplogroup d1 (y-dna)

In human genetics, Haplogroup D1 (M15) is a Y-chromosome DNA haplogroup.Haplogroup D1 is a descendent branch of the greater Haplogroup D.Its phylogenetically closest relatives are found among the peoples of Japan, Central Asia, and the Andaman Islands in the Bay of Bengal. It is more distantly related to the Haplogroup E Y-chromosomes that are common throughout Africa, the Middle East, and the Southern Balkans.