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Cousins with different y-haplogroups

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  • Cousins with different y-haplogroups

    I have a 2nd cousin whose y-haplogroup is R-L51. We both have a 4th cousin whose y-haplogroup is R-P312. We all share the same 3rd great-grandfather (this is on my mother's side, so my y-haplogroup is irrelevant). Shouldn't my 2nd cousin & 4th cousin have the exact same haplogroup? Does this indicate a NPE?

  • #2
    R-L51 is R1b1a1a2a1 ,SNP L51 defines the "1" subclade branch

    R-P312 is R1b1a1a2a1a2, SNP P312 defines the "2" subclade branch.
    R-P312 is also R-L51 (will test positive for L51), but not all R-L51's will be R-P312, some may follow a different subclade branch. (But in your case it is most likely that R-L51 will also be R-P312)

    R-P312 is just tested deeper in your haplogroup subclade.

    If R-L51 tested deeper (does yDNA SNP testing), he would also most likely test positive to at least R-P312

    One has to look at haplotree to see if one is a parent branch of the other when comparing haplogroups, unless one has done full yDNA testing which determines ones final known subclade placement
    Last edited by prairielad; 9th March 2018, 04:26 PM.

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    • #3
      Ah, I understand. Thanks!

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      • #4
        Extra info...R-P312 is all of the below, each one being an older parent branch to below it. R-P312 will test positive for each branches defining SNP below R-P312

        R1b............R-M343 formed 22800 ybp, TMRCA 20400 ybp
        R1b1...........R-L278
        R1b1a..........R-L754
        R1b1a1.........R-L389
        R1b1a1a........R-P297
        R1b1a1a2.......R-M269 formed 13300 ybp, TMRCA 6400 ybp
        R1b1a1a2a......R-L23
        R1b1a1a2a1.....R-51 formed 6100 ybp, TMRCA 5700 ybp
        R1b1a1a2a1a....R-L151
        R1b1a1a2a1a2...R-P312 formed 4800 ybp, TMRCA 4500 ybp

        Additional SNP testing may place each tester in one of the deeper subclades of R-P312
        https://www.yfull.com/tree/R-P312/

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        • #5
          Originally posted by prairielad View Post
          Extra info...R-P312 is all of the below, each one being an older parent branch to below it. R-P312 will test positive for each branches defining SNP below R-P312
          ......
          I Should re word that

          R-P312 is all of the below, each one being an older parent branch to the one below it. R-P312 will test positive for each of R-P312's older parent branches defining SNPs
          Last edited by prairielad; 10th March 2018, 01:35 AM.

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