Question

 

As is known, priests and Levites belong to different haplogroups according to samples that have been studied. That means they did not all come from the same common ancestor or a particular lineage. How does the Rabbi explain this diversity? Would a priest who belongs to one of the haplogroups that is not the majority be disqualified from the priesthood?
 
Here is an overview and table of the haplogroups found in various samples:
https://en.m.wikipedia.org/wiki/Y-chromosomal_Aaron
 
For example, if a priest took a genetic test and it turned out that he belongs to a non-Middle Eastern haplogroup—for example, R1b-M269, which is certainly Western European, or one of the variants of R1a (almost 50 percent of Ashkenazi Levites belong to this haplogroup), which is apparently a Slavic, Iranian, or Turkic lineage, depending on the variant—would he be disqualified from the priesthood? Would he be allowed to marry a divorcée? 
If they were to find a grave of a priest from the Second Temple period or earlier and take a sample, would all priests who do not belong to that same haplogroup be disqualified from the priesthood?
It is interesting that in that same source, among the Samaritans all the priests belong to haplogroup E, while most Samaritans are J2, whereas among Jews, especially Ashkenazim, there is relatively great diversity.