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Thread: Ancestry Composition Segments And IBD Segments The Same?

  1. #1
    J Man
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    Ancestry Composition Segments And IBD Segments The Same?

    Are the segments that we we have on Ancestry Composition at 23andme that for example can be listed as ''British and Irish'' or ''Finnish'' the same as the IBD segments that we share with individuals on features like Relative Finder of Family Finder over at FTDNA?

  2. #2
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    Canada Franco-Manitoban European Union Ottoman Empire Russia Imperial United States Grand Union
    Yes and no: for AC they use short phased blocks.

    https://www.23andme.com/ancestry_composition_guide/
     

    Other ancestral Y lines:

    E1b-M81 Ukraine (Ashkenazi)
    E1b-V13 England
    I1-M253 Ireland
    I2-M423 Ukraine
    R1a-L176.1 Scotland
    R1b-L584 Syria/Turkey (Sephardi)
    R1b-L20 Ireland
    R1b-L21 (1)England; (2)Wales?>Connecticut
    R1b-L48 England
    R1b-P312 Scotland
    R1b-FGC32576 Ireland

    Other ancestral mtDNA lines:

    H1b2a Ukraine (Ashkenazi)
    H6a1a3 Ukraine
    K1a9 Belarus (Ashkenazi)
    K1c2 Ireland
    V7a Ukraine

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     thetick (07-19-2014)

  4. #3
    J Man
    Guest
    Quote Originally Posted by AJL View Post
    Yes and no: for AC they use short phased blocks.

    https://www.23andme.com/ancestry_composition_guide/
    Okay well for example I have seen some French people who score around 45% or so in the British and Irish category on Ancestry Composition. I doubt those people share long IBD (15 cM+) segments with many Irish and Brits though. What do you think?

  5. #4
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    Canada Franco-Manitoban European Union Ottoman Empire Russia Imperial United States Grand Union
    ^ Yeah, that's somewhat likely to be overrepresentation of British in the database and a failure to adjust for that.
     

    Other ancestral Y lines:

    E1b-M81 Ukraine (Ashkenazi)
    E1b-V13 England
    I1-M253 Ireland
    I2-M423 Ukraine
    R1a-L176.1 Scotland
    R1b-L584 Syria/Turkey (Sephardi)
    R1b-L20 Ireland
    R1b-L21 (1)England; (2)Wales?>Connecticut
    R1b-L48 England
    R1b-P312 Scotland
    R1b-FGC32576 Ireland

    Other ancestral mtDNA lines:

    H1b2a Ukraine (Ashkenazi)
    H6a1a3 Ukraine
    K1a9 Belarus (Ashkenazi)
    K1c2 Ireland
    V7a Ukraine

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     thetick (07-19-2014)

  7. #5
    J Man
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    Quote Originally Posted by AJL View Post
    ^ Yeah, that's somewhat likely to be overrepresentation of British in the database and a failure to adjust for that.
    I don;t really understand this very well. How can a person of French or mostly French ancestry score around say 45% in the British and Irish category on Ancestry Composition but not also share numerous large 15 cM and larger IBD segments with Brits and Irish?

  8. #6
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    Canada Franco-Manitoban European Union Ottoman Empire Russia Imperial United States Grand Union
    Quote Originally Posted by J Man View Post
    I don;t really understand this very well. How can a person of French or mostly French ancestry score around say 45% in the British and Irish category on Ancestry Composition but not also share numerous large 15 cM and larger IBD segments with Brits and Irish?
    It's because even a phased block of 3 cM could be much older and is essentially not "worth the same" as an unphased block of 15.
     

    Other ancestral Y lines:

    E1b-M81 Ukraine (Ashkenazi)
    E1b-V13 England
    I1-M253 Ireland
    I2-M423 Ukraine
    R1a-L176.1 Scotland
    R1b-L584 Syria/Turkey (Sephardi)
    R1b-L20 Ireland
    R1b-L21 (1)England; (2)Wales?>Connecticut
    R1b-L48 England
    R1b-P312 Scotland
    R1b-FGC32576 Ireland

    Other ancestral mtDNA lines:

    H1b2a Ukraine (Ashkenazi)
    H6a1a3 Ukraine
    K1a9 Belarus (Ashkenazi)
    K1c2 Ireland
    V7a Ukraine

  9. The Following User Says Thank You to AJL For This Useful Post:

     dp (01-17-2015)

  10. #7
    J Man
    Guest
    Quote Originally Posted by AJL View Post
    It's because even a phased block of 3 cM could be much older and is essentially not "worth the same" as an unphased block of 15.
    So do you mean that all of those long blocks that French individuals have that show up as British and Irish on Ancestry Composition may just be small IBD segments around say 3 cM or so that are just stitched together? I am not quite sure what you mean sorry.

  11. #8
    Registered Users
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    Canada Franco-Manitoban European Union Ottoman Empire Russia Imperial United States Grand Union
    Quote Originally Posted by J Man View Post
    So do you mean that all of those long blocks that French individuals have that show up as British and Irish on Ancestry Composition may just be small IBD segments around say 3 cM or so that are just stitched together? I am not quite sure what you mean sorry.
    They might not even be IBD in any meaningful sense.
     

    Other ancestral Y lines:

    E1b-M81 Ukraine (Ashkenazi)
    E1b-V13 England
    I1-M253 Ireland
    I2-M423 Ukraine
    R1a-L176.1 Scotland
    R1b-L584 Syria/Turkey (Sephardi)
    R1b-L20 Ireland
    R1b-L21 (1)England; (2)Wales?>Connecticut
    R1b-L48 England
    R1b-P312 Scotland
    R1b-FGC32576 Ireland

    Other ancestral mtDNA lines:

    H1b2a Ukraine (Ashkenazi)
    H6a1a3 Ukraine
    K1a9 Belarus (Ashkenazi)
    K1c2 Ireland
    V7a Ukraine

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  13. #9
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    Nationality
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    Y-DNA (P)
    R-U152
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    Y-DNA (M)
    R-M405
    mtDNA (P)
    U5a1

    Netherlands Italy Italy Two Sicilies
    Quote Originally Posted by AJL View Post
    They might not even be IBD in any meaningful sense.
    How would you name it then ?
    Mc Donald:
    Most likely fit is 62.4% (+- 9.5%) Europe (various subcontinents)
    and 37.6% (+- 9.5%) Mideast (various subcontinents)
    Dodecad World9:
    1 50% S_Italian_Sicilian +50% Dutch @ 1.083
    2 50% German +50% S_Italian @ 1.126
    3 50% Dutch +50% S_Italian @ 1.148

  14. #10
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    Ancestry-informative markers called AIMs for short

  15. The Following 2 Users Say Thank You to ArmandoR1b For This Useful Post:

     AJL (01-17-2015),  Dimanto (11-14-2014)

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