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Thread: X-chromosome inheritance patterns1865 days old

  1. #21
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    Quote Originally Posted by phillymoses View Post
    I have one on 23andme, I share 17cm on the X with her (only segment we match on).
    On Gedmatch you can specifically look for matches on your X-chromosome.
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    Thank you so much for sharing these charts. I'm finding them very helpful! But just to be clear that I understand this correctly ... According to that chart, a woman can not have an X-"cousin" match with someone from her paternal grandfather's family tree. Is this correct?

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    Quote Originally Posted by Raez View Post
    Thank you so much for sharing these charts. I'm finding them very helpful! But just to be clear that I understand this correctly ... According to that chart, a woman can not have an X-"cousin" match with someone from her paternal grandfather's family tree. Is this correct?
    That is correct. Your father get his X chromosome from his mother, not his father, so you only inherit the X from your paternal grandmother - unless they or your parents were related, which is not uncommon - we all have single ancestors on multiple lineages.
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    X inheritance is different from other chromossomes. I have tested my maternal grandmother, who gave her Xs recombined to my mom. yet I got only 21.1 cM shared with my grandmother, that is roughtly 11% of her Xs. So 89% comes from my maternal grandfather.
    (according to gedmatch the size of the X is 190.1 in cM)
    Last edited by Kriptc06; 2017-09-12 at 23:31.

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    So I found a match on GEDMatch with total/largest 20.1 shared CM on X, but nothing on autosomal, is that basically a very distant relation?
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    Quote Originally Posted by a_garcia49 View Post
    So I found a match on GEDMatch with total/largest 20.1 shared CM on X, but nothing on autosomal, is that basically a very distant relation?
    yes, that can happen, so distant that you have no Au anymore. like my case I got roughly 89% from my maternal grandfather, who got both of his mothers recombined, and her got one from her mom, one from her dad so on. so I can have a X bit from 5-6 generations ago on my granfather side, that would be 1 to 3% of Au, that I could not inherit by chance.

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    a_garcia49 (2017-09-13), thetick (2017-09-13)

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