Hi All

I had some mtdna results come back and they were affected by polymorphism.

Does this polymorphism also affect YDNA results? If it does affect the results then can I rely on the test to determine a biological connection to my grandfathers anticipated biological father.

As it stands there is no connection in the last 1000 years between him and the other person being tested but my mtdna results say that me and my mother have a common ancestor 3000 years ago...