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X-DNA Advanced Advanced topics about X-Chromosome matching and anthropologic blocks based on SNPs and/or STRs.

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  #1  
Old 3rd November 2014, 06:42 PM
Oshri Oshri is offline
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how sigmificant is 55 cm match in the x chromosom

Hello,
My wife got a really good match.
She is sharing 155cm with a woman from which 55cm are on the x chromosome. Her mother's name is the same as the maiden name of my wife's maternal grandmother.

How significant is the amount shared on the x chromosome?
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  #2  
Old 4th November 2014, 04:32 PM
Kathy Johnston Kathy Johnston is offline
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Quote:
Originally Posted by Oshri View Post
Hello,
My wife got a really good match.
She is sharing 155cm with a woman from which 55cm are on the x chromosome. Her mother's name is the same as the maiden name of my wife's maternal grandmother.

How significant is the amount shared on the x chromosome?
The match does not seem close enough to be second cousins but second cousins once removed or half second cousins or something like that seems more likely. The X does not really tell you distance to most recent common ancestor very reliably but these two cousins certainly are related. You have to follow the X pattern of inheritance back in time for both pedigrees. I was trying to make a case for your wife's mother's father's mother being the MRCA with this cousin's mother's father's mother based on the same name but I can't tell for sure. It is likely to be farther back in time. Look for other names in common too.
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Old 10th November 2014, 10:04 AM
Oshri Oshri is offline
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Thanks for the information.
The match uploaded her data to GEDMATCH so i could compare it with my wife's father. The results are as follows:

Tolal cm: 176
longest block: 27
total shared on X :43
longest block on X: 43

is it safe to assume they are second cosins?
his mother and her mother has the same maiden name...
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Old 10th November 2014, 10:27 AM
hansonrf hansonrf is offline
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Could be 5 or 6 generations back...

See http://forums.familytreedna.com/show...45&postcount=1 for my relevant example.

Bob H.
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  #5  
Old 10th November 2014, 10:33 AM
Oshri Oshri is offline
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interesting, butwhat about the 176cm of autosomal DNA?

I know that people might share allot of DNA at the X chromosome.
My X chromosome is identical to the X of my maternal grandfather.
There is a chance of about 14% (~ 0.99^196) for a male to get the full X chromosome from his maternal grandfather.

Last edited by Oshri; 10th November 2014 at 10:39 AM.
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  #6  
Old 10th November 2014, 11:08 AM
hansonrf hansonrf is offline
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Originally Posted by Oshri View Post
interesting, butwhat about the 176cm of autosomal DNA?
Half first cousins-2x removed should statistically share 1.56% or 112 cM of their as-DNA; we shared 108. 7 segments, largest 28

Sorry for the error in the referenced post.

Last edited by hansonrf; 10th November 2014 at 11:08 AM. Reason: correct
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  #7  
Old 10th November 2014, 11:41 AM
Kathy Johnston Kathy Johnston is offline
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Quote:
Originally Posted by Oshri View Post
Thanks for the information.
The match uploaded her data to GEDMATCH so i could compare it with my wife's father. The results are as follows:

Tolal cm: 176
longest block: 27
total shared on X :43
longest block on X: 43

is it safe to assume they are second cosins?
his mother and her mother has the same maiden name...
Thoroughly investigate this maiden name and see what you come up with. Most people can trace their pedigrees back that far. It certainly can be second cousins.
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