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Thread: 1700s Colonial American on GEDmatch

  1. #31
    Gold Class Member
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    2,701
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    Location
    Pennsylvania
    Ethnicity
    West European
    Nationality
    USA
    Y-DNA (P)
    R1b-U152-Z36+FGC6511
    mtDNA (M)
    H11a2a

    United States of America Germany England France Scotland Ireland
    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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    North & Ionian Seas
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    never mind I misunderstood the original post.
    Last edited by JerryS.; 02-21-2019 at 06:39 AM.

  4. #33
    Registered Users
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    152
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    Omitted
    Location
    Southwest USA
    Ethnicity
    European
    Nationality
    USA
    Y-DNA (P)
    R1b1a2a1a2c1
    mtDNA (M)
    H

    Austria Hungary Ireland United States of America
    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
    RA1496 T+, RA1487 T+, DF23-, L1066-, L21+, M153-, M222-, M269+, M37-, M65-, P312+, P66-, SRY2627-, U106-, U152-, Z253-

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  6. #34
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    Chicago, Illinois
    Ethnicity
    mixed European
    Nationality
    USA
    Y-DNA (P)
    Dad: R1b/L21/DF63
    mtDNA (M)
    K2b2
    Y-DNA (M)
    R1b-M269
    mtDNA (P)
    K2b1a1a

    United States of America England Wales Sweden Germany
    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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    M222 (S588)
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    Ireland Australia Ireland County Tipperary Ireland Munster
    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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    Ireland Ireland Munster
    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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    Ireland Ireland Munster
    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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  14. #38
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    Quote Originally Posted by Dewsloth View Post
    If it’s that low that early, it probably isn’t from a full-blooded great grandparent. Do you think it could be Greenlander or pre-New Sweden visit by north europeans?
    For whatever it’s worth, on mytrueancestry my fathers kit has a match with this sample. I imagine it comes from his mother, who was adopted. His other ancestry is German, Danish, Brit Islander (of some sort)...on gedmatch he does get a kind of a lot of Finno-ugric fits. I’m wondering if this is how it’s interpreting the dna of a European with a smidgen of Inuit ancestry. To top it all off on wegene he scores some like 0.33% “Inuit”- not that if he had native it must literally be that, but given how the history of PN stands, it makes real world sense. However, wouldn’t any bit be pretty diluted by now? Completely washed out?

    It could just be speaking to a European lineage. Or maybe it’s just reflecting a little saami-type ancestry from a distant Swedish lineage.
    Last edited by Cellachán; 05-31-2019 at 01:20 PM.

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  16. #39
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    19
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    Illinois
    Ethnicity
    Mostly Mutt
    Y-DNA (P)
    BY12480+, R-Z2
    mtDNA (M)
    H5a1b
    mtDNA (P)
    H11a-, H-e15ab

    Scotland Sweden Germany Bayern Canada Quebec
    Largest segment = 5.1 cM

    Total Half-Match segments (HIR) = 1418.2 cM (39.547 Pct)

    885 shared segments found for this comparison.

    391945 SNPs used for this comparison.

    52.289 Pct SNPs are full identical
    Paternal Y=U106>Z381>L48>Z9>Z30>Z349>Z2>S15510>Y7378 mt=H11a
    Maternal mt=H5a1b

  17. #40
    Junior Member
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    Hi folks, first post here and very much a genealogical novice/newbie but I thought I'd chip in and try to help as I'm the top match with this sample on mytrueancestry.com (158 registered matches).

    I'm a native Orcadian and I believe we've got quite unique DNA so maybe this could account for the sample's back ground?

    Shared DNA: 22 SNP chains (min. 60 SNPs) / 444.54 cM
    Largest segment=3688 SNPs / 41.74 cM

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