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Which X Chromosome?

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  • Kathy Johnston
    replied
    Originally posted by peterdrh View Post
    For a female customer, does FTDNA show the matches associated with both her maternal line and her father's maternal line? Or is it just from her maternal line?
    You may be confusing the X chromosome with mitochondrial DNA (mtDNA). These are entirely different. That is a very common misconception.

    https://www.familytreedna.com/learn/...ial-dna-mtdna/

    https://www.familytreedna.com/learn/...-mitochondria/

    Everyone gets their mtDNA from the all-maternal line. It will not come in pairs so it is easily read.

    The X can pass through some males in your ancestry no matter whether you are male or female. But for males, they don't get the X from their father. They get the Y instead. There cannot be two males in a row (meaning father to son) in the line of transmission.

    The X chromosome can be passed on to daughters by a male. Generally speaking, chromosome browsers cannot distinguish which of the two homologous chromosomes a segment is found on. It works the same way whether you have two autosomes or two X chromosomes. The computer software simply reads two markers per position. If you match one out of every two markers for a series of markers, then you match a segment. You still don't know which side of the family the segment comes from unless you actually know the sequence and it is "phased" to a particular parent or you have a cousin that confirms the maternal or paternal side.

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  • MMaddi
    replied
    The autosomal tests provide matches and ancestry (ethnic) estimates based on results from the 22 pairs of autosomal chromosomes and the x chromosome in men and pair of x chromosomes in women. The autosomal chromosomes come in pairs because one is from the mother and the other is from the father. Women have a pair of x chromosomes because they get one each from their father and mother.

    There's a common misconception that women can only find matches and their ethnic ancestry admixture from their maternal side. That's not true. The test will give both men and women information from both the maternal and paternal sides.

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  • larzus
    replied
    The X matches can be from any of her X line - father's maternal side or her own maternal side, and of course spreading out from there to all other possible X-line ancestors.

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  • peterdrh
    started a topic Which X Chromosome?

    Which X Chromosome?

    For a female customer, does FTDNA show the matches associated with both her maternal line and her father's maternal line? Or is it just from her maternal line?
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