Big Y-700

FamilyTreeDNA’s Y-DNA haplotree is the largest of its kind, with over 90,000 branches and 750,000 variants. This overview outlines its structure, scientific value, and current scope as of April 2025.

FamilyTreeDNA maintains the largest Y-DNA haplotree in the world — a growing record of paternal ancestry. Each month, we update this post with the latest stats, insights, and tools to help you explore your place in history.

From significant haplogroup splits to advanced tools, explore FamilyTreeDNA’s key milestones in Y-DNA research during 2024.

Exploring your paternal lineage uncovers a treasure trove of family history. Y-DNA testing, pioneered by FamilyTreeDNA since 2000, guides this journey. You can discover new ancestors and validate family connections by testing your Y-DNA. Learn about the evolution of Y-DNA testing and the advancements reshaping our understanding of paternal ancestry.

Susan Hedeen and Tim Duncan explain how Big Y-700 testing, a coordinated outreach effort, and several trips to Scotland helped them discover the origin of two Scottish lineages.

All Big Y testers receive a lifetime analysis of their results. Learn more about the process of a lifetime analysis and what that means for your refined Y-DNA haplogroup.

Learn how DNA testing and Group Projects have transformed Irish genealogy research with Margaret O’Shea-Jordan.

Laurie Constantino shares her journey about validating Old Jock Perkin’s african ancestry through documented research and DNA testing.

Learn more about how the new FTDNATiP™ Report gives even more precise age predictions for your Y-DNA matches.

Explore Discover’s newest feature, bringing Big Y and Group Projects together for enhanced ancestry research.