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Thread: X matches treshold in CM1757 days old

  1. #1
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    Nganga Bafiote Lemba's Avatar
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    Default X matches treshold in CM

    I noticed gedmatch has a lower threshold for the X in comparison to 23andme, so my grandma matches someone on the X on gedmatch and not on 23andme, one segment is 5.7cm and the other is 3cm, is there any paper on estimated generations for CM on x ancestry?

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    Herzegovinian Montenegrin uncut's Avatar
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    I read a few words about this yesterday, no "real" source but might be interesting (you decide).
    Here: http://www.geneticsand.us/x-ch.htm

    If the X chromosome passes through a lot of men on its way to you from a distant ancestor, segments may remain longer (in cM) for more generations. A long segment could mean your common ancestor is twice as far back in time as you think it should be based on autosomal estimates simply because the X chromosome experienced a zigzag of male to female to male to female etc. transmission.
    Estimating generation times is extremely unreliable for the X based on size alone. If the segment has passed through women only, then the estimates are closer to the autosomal estimates but I don't really think the X has been studied very well in real life among enough people with great paper trails.

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    Nganga Bafiote Lemba's Avatar
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    Quote Originally Posted by uncut View Post
    I read a few words about this yesterday, no "real" source but might be interesting (you decide).
    Here: http://www.geneticsand.us/x-ch.htm
    Interesting i have a 5.7 cm and 3 cm match wtih an Igbo woman on my grandmothers X but only appears in gedmatch because 23andme requires 6 cm for woman to woman, or 7 cm, i forget. I dont think we will know for sure until the science of X-dna advances more, so in my case at small centimeres, if its close to autosomal where talking 400-500 yearse and if its just reserved by chance, up to 800 years, interesting.

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    do you think my X matches and Au here mean anything?

    Most likely fit is 63.7% (+- 4.4%) Europe (various subcontinents)
    and 11.0% (+- 0.9%) America (various subcontinents)
    and 14.4% (+- 4.6%) Mideast (various subcontinents)
    and 10.9% (+- 4.9%) Africa (various subcontinents)
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    I guess X is not that meaningful
    Last edited by Kriptc06; 2017-05-26 at 03:58.
    Most likely fit is 63.7% (+- 4.4%) Europe (various subcontinents)
    and 11.0% (+- 0.9%) America (various subcontinents)
    and 14.4% (+- 4.6%) Mideast (various subcontinents)
    and 10.9% (+- 4.9%) Africa (various subcontinents)
    Professor McDonald

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