It's complicated...: Dna tests don't compare every gene-pair in one person with those in another person. Instead, there are many types of tests. The tests look at only some sections of people's dna. One can ask the person doing the test which kind of test it is and how likely it is for various matches to occur. Lots of information is at: http://en.Wikipedia.Org/wiki/dna_profiling.
Answered 1/31/2013
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