True enough, statistically the likelihood of having dna in common with distant cousins does diminish with each generation... however, you might be surprised at what appear to be "dominant" segments that survive relatively in tact too. My maternal grandmother, aunts and I have all tested and it's interesting to see where we have matches in common. I'm always a little surprised to see when I match someone in the same place and amount as my grandmother. This also suggests that the estimated generations to a common ancestor could be off somewhat as well.
Any of the dna tests do add a new dimension to genealogy and I have more "clues" to pursue than I know what to do with sometimes. Easily more possibilities now than with any other single genealogy technique, including internet research.
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