y-DNA. What is it? Who has heard of it? All the excitement about admixture aka ethnicity in at-DNA testing and matching trees took some of the focus away from the original DNA-for-genealogy testing and my own favorite test: -- y-DNA. What is your y-DNA, if you are a man? (Only men carry y-DNA.) Is it … Continue reading y-DNA. No, it does not have admixture, but it does have thousands of years of human ancestry.