ISOGG

ISOGG, the International Society of Genetic Genealogy, is a nonprofit, volunteer-driven organization that serves the genetic genealogy community. It curates information about human Y-chromosome haplogroups and related genetic markers to aid genealogical research and education.

The organization maintains two primary online resources: the ISOGG Y-DNA Haplogroup Tree, a living phylogenetic map of Y-DNA haplogroups and their defining SNPs, and the ISOGG Wiki, a community-edited repository of pages for individual haplogroups, markers, and methodologies. These resources are updated as new SNPs are discovered and as phylogenetic understanding evolves.

Contributors include researchers and hobbyists; updates are published on the ISOGG website and through the wiki. The tree is widely used by genetic testers to interpret Y-DNA results and to understand paternal lineages. ISOGG emphasizes openness and collaboration; it is not a peer-reviewed scientific journal. While entries reflect current consensus in the genetic genealogy community, some points may differ from academic classifications.

The organization operates worldwide with volunteers who contribute to its resources. Its work is widely cited by genealogists and researchers seeking practical interpretations of Y-DNA data. ISOGG was established to provide a centralized, openly accessible resource for the genetic genealogy community.