In March, I wrote my first Blog about Emily. She is a 2nd cousin, once removed who tested her DNA at MyHeritage. Emily and her daughter Mel who are related to me on my Frazer Line have also uploaded their DNA results to Gedmatch. MyHeritage does not show X Chromosome results but Gedmatch does.
The X Chromosome
The X Chromosome is interesting as it is not inherited from father to son. As a result, when there is an X Chromosome match with someone, it is possible to narrow down where that DNA came from.
Here is how my sisters and I are related to Emily:
Note that cousin Paul got no X Chromosome on his father’s Frazer side. Also Joel, Jon and Jim got no Frazer X Chromosome. That Leaves Emily, Melanie, Heidi, Sharon and Lori.
McMaster DNA from the X Chromosome
A further interesting point is that if Heidi, Sharon, or Lori match Emily by the X Chromosome, then it would have to be from Margaret McMaster, born 1846. How do I know that? Emily got her X from Susan Fairbanks. Susan got hers from Violet Frazer. Violet Frazer got an X from George Frazer and Margaret McMaster. However, my sisters got their Frazer X from their dad. He got his only from his mother. Marion Frazer got her Frazer X DNA from her dad. James Frazer got his X DNA only from his mom Margaret McMaster. Therefore if Emily matches Heidi, Sharon, or Lori by X Chromosome, it has to be from Margaret McMaster.
Emily’s X Chromosome Matches with My Sisters
I will just be considering Emily as Melanie got half her DNA from her mother. Here is how Emily matches Lori, Sharon and Heidi on the X:
That means that Lori, Sharon and Heidi each have about 38 cM of DNA from their 2nd great grandmother.
Painting Lori
It is possible to paint or map Lori’s match using a great utility called DNAPainter:
While I’m at it, I’ll map Lori and Emily’s other non-X matches:
The blue side represents Lori’s paternal side and red is her maternal side. The greenis segments represent either George Frazer or Margaret McMaster. We can’t tell which right now. The blue indicates that we know that particular DNA is from Margaret McMaster.
Emily and My Brother Jim
I mentioned Emily and my brother JIm in my previous Blog. Even though Jim was the sixth of six siblings tested in my family, his DNA test showed he had some Frazer DNA that the other five siblings did not have. Jim’s unique Frazer segment is on Chromosome 5 as shown with his match with Emily below:
As shown in the lower left key, Jim’s matches with Emily represent DNA they both have from George Frazer and Margaret McMaster.
Going Back a Generation
Jim also matches Gladys. She is a third cousin once removed. Jim and Gladys’ common ancestors are James Frazer and Violet Frazer. From what I can figure out, these were first cousins that married each other.
This couple in yellow were the parents of George Frazer. What is interesting to note is that the match with Gladys and Jim overlaps the match with Emily and Jim on Chromosome 5. That would be considered triangulation. This indicates that this match is actually from older Frazer DNA. This also tells me that the blue DNA that Jim matched with Emily is actually Frazer and not McMaster DNA.
In theory, the DNA segments that are older should be smaller and more broken up and the DNA segments representing more recent ancestors should be larger. However, the DNA didn’t read that section on DNA theory. In practice, larger segments sometimes get passed down from many generations ago.
Next up: more painting or mapping of Lori and Jimmy’s DNA.