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The DNA test that I have done looks at 12, 25, or 37 markers on the Y chromosome. These markers are passed from father to son on the Y chromosome almost intact for hundreds of generations. The markers do mutate, at a predictable rate, which helps to estimate how far back the common male ancestor. The test will not tell you of other common ancestors. It will only tell you whether you have an Arnett common ancestor. So for the test to be valid you need a male person with the last name of Arnett/Arnet/Arnette/Arnot/Arnott. Such a test will tell you whether that person has a common Arnett ancestor with any of the other Arnett males in our study, or anybody else in the data base.
The DNA testing company does the cross-checking with all others in their data base, currently about 37.000 people. They will tell you if you have a match.
There is another DNA test that tracts similar DNA on the maternal line. But it follows the DNA from daughter to mother to mother to mother etc. I have not had my DNA tested for this because I am not a woman and it wouldn't help with my Arnett research.
I hope this answers your questions. More information can be obtained at
www.familytreedna.com
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