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Why does my daughter share more X with my mother than with me?

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  • Why does my daughter share more X with my mother than with me?

    Hi all

    A comparison, on gedmatch, of the x chromosome between my mother and myself (I'm male) shows we share 196cM. My mother and my daughter also share 196cM. Unsurprising as I would have just passed it on unchanged.

    However, the results show only 194.7cM shared between my daughter and myself. This doesn't make sense to me.

    Can anyone explain this?

  • #2
    What are the segment boundaries? If the missing part(s) are at the tips, it could be related to the pseudo-autosomal region of the Y, which has some SNPs also found on the X chromosome.

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