Why has my Y chromosome haplogroup changed?
Recenty, researchers led by Dr. Hammer, Family Tree DNA’s Chief Scientist, published the newly updated Y chromosome haplogroup tree in Genome Research. This paper recommends a number of changes in haplogroup nomenclature, which may have affected your haplogroup name. Your DNA results have not changed. You will notice that the mutation that defines your haplogroup remains the same. For example, under the old tree, marker P37.2 defined Haplogroup I1b. Under the new tree, marker P37.2 defines Haplogroup I2a. View the new tree as a PDF document.
