I-A21901 is a branch on the paternal tree of human kind. It and branches help trace human history from our origin in Africa.
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I-A21901 Technical Details
This branch is defined by the Y-Haplotree at FamilyTreeDNA as I-A21901. There, it is the child of the I-Y98720 branch.
This branch is defined by YFull as I-A21901. There, it is the child of the I-A2190 branch.
Sources & Resources
Peer reviewed sources have not been added for this branch yet. If you know of one I have missed, please link to it in the comments.