 The immediate descendants of IJ are Haplogroup I and Haplogroup J.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.