Why do you start with the Y chromosome?

Why do you start with the Y chromosome?

Alastair Greenshields (Principal) gives expert video advice on: What is DNA?; Why do you start with the Y chromosome?; Is the Y chromosome found in both sexes? and more...

Well, in genetic genealogy we use the Y chromosome because we know exactly were it comes from. We know it is only cared by males and pass from father to son, virtually unchanged in every generation so it‘s a very reliable marker for that lineage, so we can actually trace back knowingly that we are going to go back to the direct paternal line.