The X Factor – Part 2

In the last Blog, I marveled at the amount of X chromosome my sister Sharon shared with karen. Part of my amazement was that I have not had one X Chromosome match at FTDNA out of over 1,000 matches until recently. One of the reasons for that is that FTDNA doesn’t report your X matches unless you also have an autosomal match. At any rate, women tend to have more of these X Chromosome matches with other people. One obvious reason is that they have twice as many X Chromosomes to start with.

Karen has uploaded her FTDNA results to Gedmatch. Here are my sister’s top matches on the X Chromosome.

Top X Matches for Sharon

To put into perspective the size of Sharon and karen’s match, the entire X Chromosome has a size of 196 cM. 56.2 cM appears to be over 25% of that amount. This is the X Inheritance Chart for my father. My sister got one of her X Chromosomes from him and I suspect this is the source of karen and Sharon’s match. Also note that Sharon shares more of the X Chromosome with karen than she shares with her brother (me). Karen also shares more of her X with Sharon than her own brother. And as we’ll see below, this large X Chromosome segment has stayed intact and traveled down through 2 different families from at least the last part of the 1700’s!

Dad's X Inheritance

My guess was that this X match went through my ancestor Fanny McMaster b. 1829 (in pink above) to Margaret Frazer. Margaret was born around 1800. Margaret is my father’s 3rd great grandmother and my 4th great grandmother.

What I did today was to look at Karen’s tree at FTDNA.

karen's ftdna tree

For some reason, FTDNA trees use a very large font for last names. This doesn’t work out well for longer last names. At any rate, karen’s father is Walter Wanama(ker) I believe. Karen got one of her X Chromosomes from her dad, like my sister got from my dad. Karen’s dad had to get his X from his mom Agnes Higgins. She got one of her X’es from Maryann McPartland. She got one of her X’es from Ann Fraizer of Derreenargan, Boyle, Ireland. Now Boyle is in the heart of my Frazer research area where I have my Frazer DNA project. These 2 graphics above appear to show that a large chunk of X Chromosome has traveled from the late 1700’s from a Frazer family through at least 2 other fairly distantly related families to today.

Karen’s family tree showed that her Ann Fraizer married a McPartland. Our Australian Frazer DNA project member Ros pointed out this entry from the Irish Court of Petty Sessions showing the interaction between one Frazer and one McPartland:

Archibald Frazer of Ballyfarnon Defendant  Feb 1883:  That on 16 Oct 1882 at Aughnafinigan, a nuisance took place on the defendant’s premises occupied by James McPartland to wit the dwelling house so dilapidated and dirty as to be unfit for human habitation and that said nuisance is caused by the act or default of the defendant.  “Nuisance to be abated by the 8th March and house put in proper repair and to pay costs 3/6”.  The Complainants were the Guardians of the Poor of Boyle Union as Sanitary Authority.

Where Did the X Come From?

From correspondence with Karen’s family, I see they have their Ann Fraizer b. about 1823. Here’s where I get into a bit of educated guesswork. 1823 is probably the generation of my ancestor Fanny McMaster, daughter of Margaret Frazer. It is possible that Margaret had a brother who had Ann Fraizer in 1829 or so. Now Margaret’s brother would have only had one X Chromosome from his mother. That means that under my educated guess scenario, the X Chromosome match between karen and Sharon would be from Margaret Frazer’s mother.  This would be the pink box in my father’s X Inheritance Chart to the right of Margaret Frazer. That would be my 5th great grandmother. She would’ve been born in the latter part of the 1700’s.

By the way, Karen is the about the 3rd person that has been found to be related to the Frazers of North Roscommon. They have all been found to be related by DNA. Each of their ancestors has been a single Frazer that is the end of that person’s research line.

Triangulation, Anyone?

Another person in the Frazer DNA Research Project, Kathy, was quick to note that her mom also matched Karen on the X. Here is Sharon’s match with karen (in pink and orange) and Sharon’s match with Kathy’s mom in blue, pink and yellow.

Sharons X match with Karen and CJK

As these three people overlap on their matches and all match each other, this closes the loop on triangulation. So this gives us double proof of a common ancestor between karen, Sharon and Kathy.  One is by the X triangulation and second is through the X Inheritance Pattern. This is another case where the DNA is clearer than our paper research!

Kathy’s X Match Ancestor

So now that we have narrowed down karen’s and Sharon’s X match ancestors, where is Kathy’s? She should have the same ancestor as the same X Chromosome segment was passed down to her mom. Here is Kathy’s mom’s X Inheritance chart but it won’t be pretty. It was supplied by Kathy starting with Kathy’s mother’s mother:

CJK's X Inheritance

Who the X Match Cannot Be

As vague as this chart is, it tells us who the X match cannot be. We may rule out the top half of the chart (not shown). This is Kathy’s mother’s father’s X Chromosome. This is ruled out due lack of Frazer ancestry. For the same reason, we can rule out the top part of the chart that is shown. That is the Emmet family which was not even known to be from Ireland. Then we can rule out any of the people in the white boxes. This includes the male Frazer line and ancestors before Edward Wynn Frazer.

Now look in the right hand column. Under the pink and blue which is the only place where the X match could be I don’t see a lot of entries. Even in the next to the last column there is maybe a Bonis. I’m ending with this example, because this is what most people see in their own genealogy. Karen and Sharon were fortunate to both have good family trees showing where a likely match would be. Even with our better than average paper trail, my educated guess was that the our X Chromosome was coming from the mother of an unknown Frazer. That means we don’t even know the surname of this person. So the X match could be anybody – though likely limited to the North Roscommon area. I suppose this is why many people don’t use the X Chromosome much. It is fascinating and gives clues, but is difficult to use.

One Reply to “The X Factor – Part 2”

  1. My 3rd Great Grandfather was Robert White of White Hall, I am sorry that I did not make it clearer on the chart. His wife was Ismena. I have had difficultly confirming the name “Bonis” it is both unusual and rare so the spelling may have changed from the original. That is why I kept the as “?” in the chart.

    The Whites of White Hall were very connected to the Frazer and Phibbs families, that had landed estates in the Sligo-Roscommon area. The last of my 2nd great grandmother’s sons was Phibbs William White Frazer.

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