Will, Great question. Your mother had 2 X's, one from each parent. She matched her female first cousin at 52cM, which could come from either of your mother's two X's (maternal and/or paternal). When it comes to you, you only received one X from your mother. In the case you explain, if you got all of your mothers maternal X unchanged, you still might not match this cousin as part of the match your mom and she share could be from parts of both X's each girl held. But your mother most likely passed you one X which was completely recombined from the two she got. You just did not get all the matching chunks to your mothers cousin. Perhaps you are confusing mtDNA and X? They are not the same thing. mtDNA is passed down unchanged, but stored in a different location outside the cell nucleus, unlike the 23 pairs of chromosomes including X stored inside. I hope that makes sense. Good luck, Patti -----Original Message----- From: genealogy-dna-bounces@rootsweb.com [mailto:genealogy-dna-bounces@rootsweb.com] On Behalf Of Wjhonson via Sent: Wednesday, October 14, 2015 11:26 AM To: calypsospots@gmail.com; genealogy-dna@rootsweb.com Subject: Re: [DNA] X-inheritence That doesnt change that her X came to me intact. So her X matches, should match me in the exact same way. -----Original Message----- From: Karla Huebner <calypsospots@gmail.com> To: Wjhonson <wjhonson@aol.com>; genealogy-dna <genealogy-dna@rootsweb.com> Sent: Wed, Oct 14, 2015 10:08 am Subject: Re: [DNA] X-inheritence Do you know for a fact that there was no recombination? Your mother got one X from her mother, one from her father. Chances are your X has some of each unless you can show otherwise. On Wed, Oct 14, 2015 at 12:50 PM, Wjhonson via <genealogy-dna@rootsweb.com> wrote: My mother and her female first cousin share 52 cms on the X My mother passed to me (a male) her entire X intact Should not I also share exactly 52cms on the X with this same female first cousin? If not, why not? Will ------------------------------- To unsubscribe from the list, please send an email to GENEALOGY-DNA-request@rootsweb.com with the word 'unsubscribe' without the quotes in the subject and the body of the message -- Karla Huebner calypsospots AT gmail.com ------------------------------- To unsubscribe from the list, please send an email to GENEALOGY-DNA-request@rootsweb.com with the word 'unsubscribe' without the quotes in the subject and the body of the message