yDNA is a tiny portion of the entire DNA molecule that is passed from FATHER TO SON for many generations with little or no change. Because of this unique quality, it can be used as a very powerful genealogical tool to trace surnames.

Genetic genealogy (yDNA) in conjunction with traditional paper genealogy is a powerful tool that is giving researchers the means to make positive identification with their own Tannehill line

Using genetic genealogy also enables researchers ultimately to make connections across The Pond to Scotland and/or Ireland.