Thousands of family historians around the world have used DNA testing to extend their family tree and the scope of their research. This clear, concise and up-to-the-minute guide shows what genetics can do for anyone in search of their ancestors, including linking people with the same surname, unraveling clan relationships and exploring the genetic profile of individuals, locations and regions. It offers practical advice on the DNA tests available including the y-chromosome, mitochondrial and ancestry tests, helping you to choose the right test and use the results effectively. From the latest discoveries in the big surname studies to advice on starting your own DNA project, this is a fascinating introduction that will dominate future family history research.