This project is about a Y-haplogroup, which defines a group of men by a shared set of inherited features in the DNA of their Y-chromosome. This implies they have a patrilineal ancestor in common, because only males carry a Y-chromosome, which they inherit from their father. The major Y-haplogroups were formed thousands of years ago, and therefore each group can today include thousands to millions of men. For an introduction, you can visit the Y-DNA Haplogroups project, the DNA Testing project, or start at the beginning with the DNA Primer project.
This haplogroup project's name uses the older, now secondary, hierarchical format for Y-chromosome haplogroup names. Because the haplogroup names under this earlier system would change with the identification of new branches, it's no longer possible to know unambiguously to which current haplogroup this designation refers. Anyone with an old test result that assigned them to a Y-haplogroup with this name should update their information to use a shorthand format name that references a defining SNP.
Naming History
In the ISOGG Y-DNA tree naming history, "A1b1" has always referred to the haplogroup A1b1-L419 and therefore all profiles designated A1b1 are probably A1b1-L419. However, consulting their original testing data SNP values should be done before changing their assignment.
- Y-Haplogroup A @ Wikipedia
- Y-Haplogroup A @ ISOGG
- A (Y-DNA) @ Geni
- Y-DNA haplogroups @ Geni
History of the A1b1 Name at ISOGG
This is the history of the haplogroup name "A1b1" at ISOGG, which in 2017 is generally considered the primary naming authority for Y-DNA haplogroups.
- ISOGG v7.65 (5 Dec 2012): A1b1-L419 (first use)
- ISOGG v8.71 (22 Aug 2013): A1b1-L419/PF712
- ... same for intermediate dates ...
- ISOGG v12.4 (4-Jan-2017): A1b1-L419/PF712