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An FTDNA "identical twin". What are the odds?

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  • An FTDNA "identical twin". What are the odds?

    I just received an updated version of my 12 marker Ydna matches. It turns out that one of my Ydna matches is an HVR 1 and 2 Mtdna match as well. This is not a case of cousins mating within the same local area. The respective families (different surnames) come from different countries separated by hundreds of miles. Has anyone else experienced this pattern?

    Trying to estimate the extent of genetic overlap raises another question. Are the relevant genes inherited individually or in a cluster with other genes. That is, if people share Mtdna or non-recombinant Y genes do they also tend to share other genes as well. My question is empirical rather than just theoretical. Would appreciate any information on these issues.

  • #2
    Originally posted by josh w.
    I just received an updated version of my 12 marker Ydna matches. It turns out that one of my Ydna matches is an HVR 1 and 2 Mtdna match as well. This is not a case of cousins mating within the same local area. The respective families (different surnames) come from different countries separated by hundreds of miles. Has anyone else experienced this pattern?

    Trying to estimate the extent of genetic overlap raises another question. Are the relevant genes inherited individually or in a cluster with other genes. That is, if people share Mtdna or non-recombinant Y genes do they also tend to share other genes as well. My question is empirical rather than just theoretical. Would appreciate any information on these issues.
    1st regular genes come from all grandparents not just ydna-mtdna

    I do the genealogy of a 3 city area and 3 surnames in and out of that area
    i have many examples of what probably happened. either two brothers married two sisters a common event.or Two men carring the common ydna for the area married two sisters. remember there where usually arranged weddings

    one of my locational studies is frosinone province italy it has 13 members men and women. 3 of the men are e3b they match 12/12. I am thinking that this is a common ydna for this area. The one with the 25 markers is my son
    we decend from longford ireland 1770ish but we match the two other males both of whom carry surnames very common in the area.thats one half of your problem
    The other half is mtdna well my son has my wife's mtdna mazzola. he and the second mtdna tested match hrv1 she doesnt carry a frosinone surname but he mom did so lets say her mom and my mother in law were maternal cousins sharing a grand mom . and say this 2nd hrv1 married one of the guys carring my e3b1 alpha cluster [my match] that would make your same situation all in two generations.Even though the distance was great between us the matchs happen. so your situation isnt rare
    I 13 22 14 10 12 14 11 14 11 12 11 28 15 8 9 8 11 23 16 20 27 11 15 15 16 11 10 19 21 14 14 16 18 36 36 12 10
    13 23 13 10 13 17 11 12 12 14 13 30
    O1 13 23 15 10 13 13 11 12 12 12 14 28
    E3b 13 24 13 10 16 18 11 12 12 13 11 30
    E3b 13 24 13 10 16 18 11 12 12 13 11 30
    E3b 13 24 13 10 16 18 11 12 12 13 11 30 16 9 9 11 11 26 14 20 33 14 16 16 17
    R1b 13 24 14 11 11 13 12 12 13 13 13 29
    I 13 24 16 11 12 17 11 13 12 12 11 30
    G 14 22 15 10 14 14 11 12 10 12 11 28
    -------------------------------------

    Haplo ---- HVR1 -------------------------------------- HVR2
    H 519C------------------------------------------- 263G,315.1C
    C 223T,292T,298C,311C,325C,327T,362C
    H 519C
    J2 069T,126C,148T,193T,213A

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    • #3
      Jim, thanks for your information. Your Mtdna example suggests a common Italian ancestor within three generations. My situation reveals no common three generation ancestor for either maternal or paternal lines. There are some similarites: all the families are of Jewish origin and all came from eastern Europe. Thanks again.

      Josh

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      • #4
        Originally posted by josh w.
        Jim, thanks for your information. Your Mtdna example suggests a common Italian ancestor within three generations. My situation reveals no common three generation ancestor for either maternal or paternal lines. There are some similarites: all the families are of Jewish origin and all came from eastern Europe. Thanks again.

        Josh
        i was just trying to make the point its common and can be recent

        people look at the odds on relationship and the natural thing is to assume 97% at 600 is what it must be but it can be your son 23 yrs.allow for both ends of the spectrum to be the one. thats all

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