Haplogroup O-CTS3994 is a Y-chromosome (paternal) haplogroup on TheYtree, catalogued with its defining mutations, sample distribution and phylogenetic tree.
| ISOGG name | O2a2a1a1a1 |
|---|---|
| Defining mutations | 16 |
| Downstream branches | 137 |
| Estimated age | 8,240 years |