What is a multi-copy Y-STR marker?
Multi-copy Y-STR markers are STRs that occur more than once in the human genome. This means each marker will have more than one allele value in a paternal ancestry report.
For example, the DYS385, DYS459 and YCAII are typically present at two different locations on the Y chromosome; therefore, they are also termed “duplicated markers.”
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