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Thread: 1700s Colonial American on GEDmatch

  1. #31
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    On the Amerindian question that has been mentioned several times, while agreeing somewhat with some of the assertions made so far, I have some additional thoughts:

    1) The op has already stated that the MDLP K22 calculator yielded a 3% result. I don't think with the low overlap between the Gedmatch calculators and this kit that we can be confident in the percentage of 1% or 3%. It is a bit of luck-of-the-draw as to whether a particular calculator happens to test many of the remaining sub-segments from a possible first generation Amerind ancestor.
    2) It seems by the age of the burial of this person that there could have been several generations from 1610 to mid-1700s.
    3) There isn't any solid/magic number for figuring out real vs. misconstrued Amerind admixture like 1%, 2%, etc. As has been mentioned, some Europeans can score high numbers and, obviously, if someone has an Amerind g-g-g grandparent or so, there could be real admixture surviving that is kind of small.

    There are lots of things that can help. Here is a picture:

    AmerindExample.png

    The first snippet is a chromosome painting of one of my mother's one-to-one matches that almost certainly has an Amerind ancestor. The person has an Amerind mtdna haplotype. Also, the person has several well-organized snippets of Amerind admixture (the darker blue color in the picture) like this one. However, the total is a little over 1 1/2 percent.

    The second match is one of my father's several matches to kits from Russia. This person has a very high Siberian admixture percentage and over 3 1/2 percent "Amerind". The Amerind for this person is almost all just a small layer/part of larger Siberian (teal) and East Asian (light blue) admixture. Probably some ANE/Siberian/East Asian type admixture just happens to be together in such a way as to simulate Amerind to the admixture tool.

    It is important to do more than just look at the total percentage. Opportunity, other matches, how the admixture appears/is organized, Y or mtdna haplotype, etc. should also be taken in to account.

    I am thinking that it is really difficult for this kit to really say because of the low SNP overlap not allowing a very good investigation of the kit's minor admixture. There isn't enough to be overwhelming and the person seems to have some northern European ancestry, too. There are a few candidate segments on the kit that seem fairly interesting, but who is to say, really?
    Last edited by randwulf; 02-21-2019 at 01:35 PM.

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  3. #32
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    never mind I misunderstood the original post.
    Last edited by JerryS.; 02-21-2019 at 06:39 AM.

  4. #33
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    For your comparison
    This kit is 50% Irish 25% Austrian 25% Hungarian
    There is no Colonial American in this paper trail

    Largest segment = 4.4 cM

    Total Half-Match segments (HIR) = 444.3 cM (12.392 Pct)

    313 shared segments found for this comparison.

    159068 SNPs used for this comparison.

    53.769 Pct SNPs are full identical
    390=21
    459a/b=9/9
    YCA II a/b=22/23
    557=15
    572=10
    DF23-, L1066-, L21+, M153-, M222-, M269+, M37-, M65-, P312+, P66-, SRY2627-, U106-, U152-, Z253-

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  6. #34
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    Me (about 67.5% English, Welsh, other British Isles; 20% German/French/Dutch; 12.5% Swedish, although could be less German more British Isles; lots of colonial American but no crossover with Swedish colonial American, Swedish came in 1889)

    53.769 Pct SNPs are full identicalLargest segment = 5.5 cM

    Total Half-Match segments (HIR) = 466.0 cM (13.017 Pct)

    294 shared segments found for this comparison.

    107582 SNPs used for this comparison.

    49.694 Pct SNPs are full identical

    But that's with the 25 and 1 criteria, which I am not convinced is useful, wouldn't you get the same kind of results with all humans?

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  8. #35
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    This is what I got using the same criteria.

    Largest segment = 8.4 cM

    Total Half-Match segments (HIR) = 491.8 cM (13.718 Pct)

    309 shared segments found for this comparison.

    119600 SNPs used for this comparison.

    52.338 Pct SNPs are full identical

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  10. #36
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    Quote Originally Posted by Bollox79 View Post
    I still think it's a bit strange that no one shares ANY CM on their segments with this kit ... <Snip>
    When I looked at this kit just now, he does have a modern match (A595016) using the default settings of 7 cm at 7.4 generations. (7.9 CM)

    7.4 x 30 year average generation = 222 years which is ≈ okay with the date given of 269 26 years ago.

    Is this a new match?
    Last edited by Garvan; 02-23-2019 at 10:49 AM.

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  12. #37
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    Quote Originally Posted by Garvan View Post
    When I looked at this kit just now, he does have a modern match (A595016) using the default settings of 7 cm at 7.4 generations. (7.9 CM)

    7.4 x 30 year average generation = 222 years which is ≈ okay with the date given of 269 26 years ago.

    Is this a new match?
    I just realized my calculation of generations does not work because this is aDNA. I will try to do better.

    PS:
    I get 300 years to last common ancestor.
    Last edited by Garvan; 02-23-2019 at 12:26 PM.

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