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Qestion about my XX chromosomes

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  • Qestion about my XX chromosomes

    Hello, I am a woman and have 2 X chromosomes (one from my mother, and one from my father). I know my maternal haplogroup which comes from one of my X chromosomes. But what's about the other one of my X chromosomes which comes from my father? He got his X from this mother, my paternal grandmother. So why it isn't possible to see the haplogroup of this paternal X chromosome when I do a DNA analysis? Why do I get the maternal X result only?
    Last edited by Catrin; 7 October 2022, 06:13 AM.

  • #2
    The X chromosomes don't provide the maternal haplogroup. Mitochondrial DNA does that, and it's a different test than Family Finder (which is an autosomal test). If you want your mitochondrial haplogroup, you need to do a mtDNA test at FTDNA. This article explains the four different kinds of DNA: https://dna-explained.com/2012/10/01...tic-genealogy/
    Last edited by blanko; 7 October 2022, 09:59 AM.

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    • #3
      I know my mtDNA, as I wrote (it's U5b2a1b1a), that was not my question. Sorry, my English is not so good. You wrote that the mitochondrial DNA provides the maternal haplogroup. My father got his mtDNA from his mother, but he can't pass on this mtDNA to me, right? Ok, I think I understand. But I got one of my X chromosomes from him, so what can this paternal X chromosomes tell me about my ancestors?

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      • #4
        The X chromosome can be used to narrow down which ancestors could have passed any of it down to you. This will eliminate other lines which could not pass down the X chromosome. This can help you to see how you are related to a DNA match.

        You can use charts for male and female inheritance patterns for the X chromosome to see which ancestors can pass it on. This article is good and has links to other articles that may be helpful: https://dna-explained.com/2014/01/23...osome-that-is/
        Another good article on the X chromosome is here, and also has links to other information: https://genie1.au/x-dnas-helpful-inheritance-patterns/ There is a section showing practical use of the X chromosome. There are more resources in this post in the FTDNA forums: https://forums.familytreedna.com/for...e-x-chromosome

        A father's X chromosome is inherited from his mother with no recombination. So it will be one of his mother's X chromosomes which usually will be recombined from both of her parents X chromosomes. On the other hand, an X chromosome from your mother is usually recombined from her parents X chromosomes. It's like the male X skips a generation, in a way. This article has some images showing the differences in male and female X chromosome recombination: https://smithplanet.com/stuff/x-chromosome.htm

        Your father, his mother, or a female sibling of either of them would need to do an mtDNA test to get your father's mtDNA haplogroup, in case you're interested.

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        • #5
          Thank you very much.
          My father and mother are both dead, even the siblings of my father. My mother didn't have siblings.

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          • #6
            If your father had a sister who is now dead but who had children, one of those children could do the mtDNA test if you want to know that haplogroup. Those children would inherit your paternal grandmother's mtDNA (mother of your father).

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            • #7
              I stumbled upon my paternal grandmother, Laura's partial mtDna at 23 and Me from my 1C1XR, Peter, who tested there and was one of my matches. My father's mother's mtDna was passed to her daughter, Laura, and then to her daughter, Jean, and then to her son, Peter, who 23 and Me gave the partial J1c8, which is obviously that of my paternal grandmother, Laura.

              And BTW, the X Chromo is Chromo 23, autosomally.

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