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Is there any signficance to rare marker values ?

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  • Is there any signficance to rare marker values ?

    I recently ran across an Allele Frequency chart in Rootsweb where somebody extracted all the entries in Y-Search. They made a chart of the distribution of Y-STR marker values grouped by major haplogroups. I was very surprised to see how different the distributions were between each major haplogroup - there is a definite tie of SNP values (deep ancestry) to STR values (genealogically significant markers) that I was not expecting. R1b has 22,129 submissions.

    I looked at one of the R1b Casey clusters (I am a co-admin for this surname and the Brooks surname) and found that the MRCA haplotype had some fairly rare marker values:

    460 = 13 (less than 0.5 %)
    464a = 13 (2 %)
    464b = 14 (2 %)
    459a = 8 (3 %)
    393 = 12 (4 %)
    464c = 15 (11 %)
    534 = 14 (13 %)
    481 = 23 (17 %)
    459b = 9 (17 %)
    458 = 16 (18 %)

    Obviously, these are the marker values that set my cluster apart from the other 22,000 submissions in Y-Search. I keep thinking that there must be other significant information to discovered with these more rare values of markers - but I can not come up with any genealogically significant implications. Anyone have some insight on how these more rare values can be used in the anlaysis of this cluster ?

    Another issue that baffles me is that all twleve 67 marker submissions in this cluster have the exact same marker values from 38 to 67. There are 8 different lines that average about 8 or 9 generations to each oldest ancestor. These markers are very poor for R1b as shown below:

    472 = 8 (over 99.5 %)
    425 = 12 (over 99.5 %)
    590 = 8 (99 %)
    436 = 12 (99 %)
    641 = 10 (98 %)
    578 = 9 (97 %)
    450 = 8 (97 %)
    Most others (above 90 %)
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