Just curious, does anyone know why Japanese (especially Ainu), Tibetans, and people from the Andaman Islands are said to have the highest concentrations of Haplogroup D than anywhere else in the world? I just find it odd because they are so far away from one another. With other Haplogroups, you can see a connection in the surrounding areas. Why isn't this found in high concentrations in places in between, like among Koreans and Han Chinese and Indians? It seems to barely exist at all outside of those three groups (with small number of Sumatrans and a barely visible number of Han Chinese, Central Asians like Uighurs, and Southeast Asians like Hmong-Mien and Thai people having Haplogroup D people). Does this suggest these groups are somehow more related to each other than their own neighbors? What is the missing connection?
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Wow, I just found something even more interesting about Haplogroup D relating to Haplogroup DE (Haplogroup D being found in only Asia in the present day as mentioned above, and Haplogroup E only being found in Africa in the present day). Apparently individuals that still belong to DE are in Nigeria, Guinea Bissau, and Tibet.