 Its sole sibling is K (which includes most of the world's male population).Haplogroup IJ derived populations account for a significant proportion of the pre-modern populations of Europe (especially Scandinavia and the Balkans), Anatolia, the Middle East (especially Arabia, The Caucasus, Levant and Mesopotamia) and coastal North Africa.As a result of mass migrations during the modern era, they are now also significant in The Americas and Australasia.