What is yDNA?
A good explanation can be found here. But, briefly a person’s paternal ancestry can be traced by DNA on the Y-Chromosome or yDNA for short. Only men have a Y-Chromosome, which they inherited from their father and will pass on to their sons. What this means is that a man will have exactly the same DNA as his father and his father before him and so on. Scientific research throughout the world has shown that all our paternal lines are connected somewhere in the past and that these connections can be traced by reading the yDNA. The yDNA mutates very slowly over generations which means we may be able to connect up many lines and see if there was a common ancestor.
