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There are a number of DNA test organizations. I used familytreedna.com which also does the testing for National Geographic Genographic Project (see their website also).
We are only talking here about DNA analysis of the male Y-chromosone, and only a portion of it that provides distinct markers which represent major mutations that help identify one line from another and are time sequenced. This is being used by genetic researchers to determine major human migration paths in history.
The Y-chromosone is inherited intact from father to son and is not mixed with the mothers DNA, so a mismatch with another male means that two individuals are not related in the near time scale.
Besides the interest in deep ancestral origins revealed by the results, the information is only useful for genealogy if a number of individuals can be compared. It is useful as a means to sort out "possibles" from "absolutely not possible".
Maybe I should continue this conversion with direct e-mail to you if you would like because the answers to your questions will be somewhat lengthy.
Just one teaser here however. Would you have thought that the Mohr family origins could have included a migration out of Sardinia some 7000 years ago?
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