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How many X matches do you have?

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  • How many X matches do you have?

    I have a total of 938 FF matches with only 20 X Chromosome matches...My Dad has a total of 859 FF matches with 20 X Chromosome matches. I know he and I wont share X Chromosome matches....But is it just pure coincidence that we each have exactly 20 X matches? Or is there a maximum limit that can be displayed etc?

  • #2
    I have 1062 FF matches and only 9 X matches. Yesterday I noticed one of my FF matches that is also on gedmatch showing X matching on gedmatch but not showing X on FF.

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    • #3
      Looks like coincidence. I have 25 X matches so 20 is not the max limit.

      However, I know for a fact that their system isn't registering all X matches. On Gedmatch, an individual will show as an X match but the same individual on FTDNA doesn't. I think FTDNA is dismissing matches with only small segment matches but I wish we had the ability to set our own criteria, like Gedmatch.

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      • #4
        Two - my mother and my brother.

        I have several predicted matches that don't match my mother.

        My mother's 2nd cousin's daughter whose relationship would qualify her to be an x match doesn't match on x but she is a close autosomal match.

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        • #5
          At FTDNA, you have to have an autosomal match meeting the criteria before an X match shows up. If you want to see your X-only matches, without having an autosomal match included, you have to upload to a third party site such as GEDmatch and you will only see those who have uploaded their Xs too.

          X matches will be listed on your match list, even those that are too small. I believe that there are a lot of coincidental, or IBS = identical by state X matches but these are showing up mostly on a female's match list. Males have more IBD, or identical by descent X matches because they only have one X to compare. In general, the number of X matches showing up for a male is much, much lower than for a female with the same ethnic makeup. I think the total number of males and total number of females testing is about the same but some people do not list their gender which makes it difficult to count. Some females are defaulting to males, or so it seems if they don't list their gender at all. Some females are testing their male family members but putting their own names on the test.

          I recently looked at 251 Family Finder matches and the number of X matches is indeed very interesting. I tried to calculate males and females as best as I could but there could be errors.

          Non-Jewish Diaspora males will find that an average of 1.3 % of their total matches will also have an X match. Therefore if you have a thousand matches, and you are a male, it is quite common to have around 10 to 20 X matches currently at FTDNA. It is coincidental that it is exactly 20 between a father and a son but I am not surprised. 56% of FF males in our project had four or fewer X matches. Jewish Diaspora males can have several hundred X matches.

          Non-Jewish Diaspora females find that an average of 25% of their total matches will also have an X match. I found that non-Jewish females had roughly an average of 124 X matches for the first 4 months of this year. Of their X matches, the females outnumber the males on average by 9 to 1. I know of one female who has more than 3,000 FF matches and over a thousand X matches as well but she shows a majority Jewish Diaspora in her myOrigins calculation. Her male to female X ratios were much higher too.

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          • #6
            I am female. I have 106 FF matches and 20 X matches, almost 20%
            Sharon

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            • #7
              I have 313 FF matches and 53 X matches.

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              • #8
                Originally posted by sharzie View Post
                I am female. I have 106 FF matches and 20 X matches, almost 20%
                Sharon
                Actually I went back and recalculated the non-Jewish females and I got an average of 21% X matches for females. The average non-Jewish female had about 101 X matches out of 474 total FF matches in our project for the first four months of 2014. I probably should double check all my calculations.

                What is your male to female ratio among your X matches? Make sure the ones that are listed as males actually look like males.

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                • #9
                  Kit A: 930 FF matches and 158 X matches
                  Kit B: 157 FF matches and 22 X matches
                  Kit C: 861 FF matches and 113 x matches
                  Kit D: 320 FF matches and 6 X matches
                  Kit E: 553 FF matches and 3 X matches
                  Kit F: 526 FF matches and 2 X matches

                  All kits are unrelated. The first three are female.

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                  • #10
                    I only have 10 X matches; and currently 412 total FF matches. They (X matches) are all distant.

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                    • #11
                      I have 318 FF matches, 53 of which are also X matches.

                      Men: 2 (5th to remote)
                      Women: 51
                      3rd-5th: 3
                      4th to remote: 8
                      The rest are 5th to remote

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                      • #12
                        Originally posted by PDHOTLEN View Post
                        I only have 10 X matches; and currently 412 total FF matches. They (X matches) are all distant.
                        Looking at mine again, one is 3rd to remote. I don't know how she is connect to me, but her tree looks colonial-related. Then I have two as 4th to remote. The rest are all 5th to remote.

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                        • #13
                          Originally posted by PDHOTLEN View Post
                          Looking at mine again, one is 3rd to remote. I don't know how she is connect to me, but her tree looks colonial-related. Then I have two as 4th to remote. The rest are all 5th to remote.
                          One of those 5th to remote is from Sweden. I mean, the whole tree is from Sweden, including the person who took the test. They never went to North America, it looks like. My X chromosome is only from my mother. The only Swedish persons on that side are way way back in my direct maternal line (offshoots). They were connected with New Sweden (1600s). Hmm...

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                          • #14
                            Originally posted by Kathy Johnston View Post
                            Actually I went back and recalculated the non-Jewish females and I got an average of 21% X matches for females. The average non-Jewish female had about 101 X matches out of 474 total FF matches in our project for the first four months of 2014. I probably should double check all my calculations.

                            What is your male to female ratio among your X matches? Make sure the ones that are listed as males actually look like males.
                            I'm female with 29% X-matches-- 170 Xs within a total of 584 FF matches. Male to female ratio 1:16 (10 male, 160 female).

                            No known Jewish lineage either DNA or on paper. But a very large amount of my matches have Spanish colonial origins in New Mexico. I know they must be from my Spanish Californian maternal grandmother but since her records are good dating back to about 1750 and show nothing in New Mexico I can't figure out the connection. My theory is the MRCA is from a founding family in Old Mexico in 16th or 17th century, and high intermarriage in the isolated NM colony makes the matches appear closer.

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                            • #15
                              I have one match out of 118 here. She is a female. FWIW, if we had the same match criteria as 23andMe, I'd probably have about 12 matches if not more (assuming as many people with AJ bckground test here as there). 10% of my matches I am sharing with at 23andMe are on the X and are AJ.

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