You should test more Y-chromosome DNA short tandem repeat (STR) markers when you wish to compare additional markers against others with similar results. They will refine your matches for genealogical purposes. It does not increase the number of generations traced by a Y-DNA STR test but rather reduces the range of generations in the time to a common ancestor with your match.
The Phillips DNA Project News
Do more Y-DNA STR markers improve the quality of matches’ information?
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- Written by Nancy Kiser