Y-DNA Testing

Western Atlantic Modal Haplotype Badge

If you have a Western Atlantic Modal Haplotype Match badge in the Badges section of your dashboard, it means that you match or are close to the historic Western Atlantic Modal Haplotype (WAMH) that has [...]

Niall of the Nine Hostages Badge

If you have a Niall of the Nine Hostages badge in the Badges section of your dashboard, this means that you match exactly or are a close match to the historic Irish Modal Haplotype (IMH). [...]

Our Three Basic Tests

We offer three basic types of tests: Family Finder (autosomal DNA), Y-DNA, and mitochondrial DNA (mtDNA). Note: Click on the blue boxes () below for information on each topic. Our Family Finder test focuses on autosomal DNA, which [...]

Big Y Block Tree

The Big Y Block Tree is a vertical-block diagram of the Y-DNA Haplotree showing the relationships between you and other Big Y testers. This tool helps you visualize how the paternal lineages of you and [...]

Big Y

Please note that as of January 30, 2019 the Big Y-700 test is now available, and the Big Y-500 test is no longer available for purchase. The Big Y is a Y-chromosome direct paternal line test. We have designed it to [...]

Which Y-DNA STR markers do FamilyTreeDNA test?

At FamilyTreeDNA, we test 561 Y-chromosome DNA short tandem repeat (STR) markers in our standard Y-STR tests: Y-DNA12, Y-DNA25, Y-DNA37, Y-DNA67, Y-DNA111, and Big Y. The chart below shows a list of all markers offered [...]