Which proves there never was some sort of "pure, unbroken line" of paternity, or maternity. Of course, there isn't even agreement on which form of decent is "correct". It's maternal in the OT, sometimes paternal by "tradition"/surname and either/both/neither, as needed thereafter. Not even Israel can/will define the term, much less the myriad "religious interpretations", as if they have any place in Science, or the study of genetics.

Until such time as even a basic definition of terms can be agreed upon, all of these "studies" are a waste of time and money.