Haplogroup J-Z640 is a Y-chromosome (paternal) haplogroup on TheYtree, catalogued with its defining mutations, sample distribution and phylogenetic tree.
| ISOGG name | J1a2a1a2d2b2b2c4c~ |
|---|---|
| Defining mutations | 20 |
| Downstream branches | 245 |
| Estimated age | 4,500 years |