Y-DNA topics

Y-DNA is passed down from father to son, so if you are a male, you will have received your Y-DNA from your father's father's father etc. It can be used to connect with distant cousins on the direct male line. Because the surname is also passed down from father to son, Y-DNA can be very useful for people who are researching a particular surname and is used quite frequently in One-Name Studies.

The Y-DNA test has a "reach" of about 330,000 years and so can also be used for exploring the deep ancestry on your direct male line (your father's father's father etc). This will give you an indication of  the route that your ancestors took during the last major human migration out of Africa.


  1. How do I convert yDNA test results from my late cousin's 2006 Relative Genetics 43-marker test to my 2017 FTDNA 111-marker test? At DYS452 he is 6 and I am 25. At DYS463 he is 20 and I am 22.

    1. Good question. I have had this problem occasionally before and the following links were helpful. But for a definitive answer, you may have to ask the company involved to ask their science team ...