W, Your mother, being a woman, has two X chromosomes, you (male) have just one. All of your X chromosome will match your mother, but quite possibly, parts of it will match her on one of the Xs, and parts on the other. But any place on your X chromosome only matches to one of your mother's two X chromosomes. The match between your mother and her cousin must be on the X chromosome that you don't match, at that region. I don't think you can be sure that you have an intact chromosome from your mother - one end of your X chromosome might match to the X chromosome your mother inherited from her mother, and the other end might match to the X chromosome your mother inherited from her father, and you would still show a perfect match to your mother over the whole length of your X chromosome. Paul Rakow Wjhonson wrote: > > > 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 > > >