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Thread: A curious X-match of mine

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    Talking A curious X-match of mine

    I only have 13 (I think it is) X-matches after all these years. I recently got the 13th one. It is to a female in Norway (email address in Norway). Her apparent brother or close relative with the same surname also came in, but he is only an FF match (no X-match). Said female is also an FF match. That is the only basic facts I have.

    My Norwegian ancestry is entirely from my father. I am assuming that this Norwegian X-match is not related to him, since I did not get a X chromosome from my dad. So this X-match must be from my mother's side. According to the family tree I constructed for myself, the only way that X-match could happen is via a line going back to Delaware Swedes in colonial times. I notice one line is given as coming from Varmland province on the Norwegian border.

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     AJL (07-10-2015), Grossvater (06-27-2015), khanabadoshi (08-01-2015), Rebecca (06-14-2016), Reith (07-30-2015)

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    Quote Originally Posted by Baltimore1937 View Post
    I notice one line is given as coming from Varmland province on the Norwegian border.
    That's an interesting area because it was home to a number of Forest Finns, some of whom came to New Sweden.
     

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    Quote Originally Posted by AJL View Post
    That's an interesting area because it was home to a number of Forest Finns, some of whom came to New Sweden.
    That's what I was thinking (Forest Finns). But since I wrote the above post, I did an "in common with", and see there are also American connections over and above the Norwegian names. Actually, those names were on her brother's tree. She didn't give out any information about herself.

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    Quote Originally Posted by Baltimore1937 View Post
    I only have 13 (I think it is) X-matches after all these years. I recently got the 13th one. It is to a female in Norway (email address in Norway). Her apparent brother or close relative with the same surname also came in, but he is only an FF match (no X-match). Said female is also an FF match. That is the only basic facts I have.
    So you are talking about X-matches on Family Finder? Have you looked at X-matches on GEDmatch.com?

    Jack

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    Quote Originally Posted by C J Wyatt III View Post
    So you are talking about X-matches on Family Finder? Have you looked at X-matches on GEDmatch.com?

    Jack
    No, I've never done anything with Gedmatch. With my wobbly WiFi connection, I don't try to do things like data downloading/uploading. I have lots of Scandinavian FF matches that I don't get involved with. Their surnames are this-son and that-dotter by the dozens.

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    Quote Originally Posted by Baltimore1937 View Post
    No, I've never done anything with Gedmatch. With my wobbly WiFi connection, I don't try to do things like data downloading/uploading. I have lots of Scandinavian FF matches that I don't get involved with. Their surnames are this-son and that-dotter by the dozens.
    Thank you, Baltimore1937.

    Family Finder does not give you anything close to the true number of your X-DNA connections. If you were able to upload to GEDmatch, I think you would find a bunch more. My mother gets a whole lot of X-DNA matches, so I would be curious to compare. It's a long shot, but by chance do you have anyone with my surname on your FF match list?

    Jack Wyatt

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    In 2014 Family Tree DNA added X chromosome matches to those who already match on the autosomes. Unfortunately some people have significant X matches with no autosomal match and will not show up as a match at all at FTDNA. The X is only one out of many chromosomes so it also takes a large population of people to get a match in the first place.

    The X match list is full of people who only match at 1 cM on the X so that list of X matches is inflated, particularly for women. I am a female and I have 166 "X matches" (most are not meaningful) outside my immediate family but my father has only 4 X matches at FTDNA. He has more than a thousand autosomal matches. This gender difference is typical. My father has more total FF autosomal matches than I do and the overall numbers of females are similar to males. Endogamous populations will show proportionally more X matches than this in general.

    You will often need to increase the threshold to 5+ cM or higher at Family Tree DNA to find a meaningful X match. Most of the matches for females at FTDNA are false positives and those should disappear above 10 cM.

    The threshold of 1 cM causes many more matches for females than for males. Females will have a lot of pseudo-segment matches due to the fact that they have two X chromosomes and these are not phased. Males are naturally phased and the segment matches are more likely to be identical-by-descent because the sequence is not ambiguous for their single X chromosome. Therefore, the sensitivity of the test is much higher for males. The gender differences are enormous and it is not just because females have twice as many X chromosomes to match.

    Kathy

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     dp (07-31-2015)

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    Kathy, if you were looking for X-DNA matches on GEDmatch, what parameters would you use?

    Jack Wyatt

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    Reading these posts got me thinking about X matches of my relatives at 23andme (Countries of Ancestry).
    paternal aunt's:

    [the Austrian match surprised me. The aunt below is maternal 2nd cousin of the one below. The two don't share many foreign matches.]

    maternal aunt's:

    [I was glad to see a Scandinavian match. I wonder why this one has so many more X matches?]
    -dp

    PS: is there an IBD/IBS threshold for X segments. Would say 12cM be enough to assume that the segment is IBD?
    In other words does at least the first aunt share IBD -X- segments with foreign matches?
    Last edited by dp; 07-31-2015 at 07:43 PM.
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    David,

    Are your aunts' kits on GEDmatch? I'd like to take a look if it is possible.

    Thanks.

    Jack Wyatt

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