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can i assume that a match on chromo 9 (29 cm) and chrom 23 (24 cm) are on the same 4th gen as given by gedmatch?
+6
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238
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triangulation
dna
x-chromosome
asked
May 28, 2017
in
Genealogy Help
by
Lucien Provost-Pilotte
G2G Crew
(
310
points)
retagged
Oct 24, 2017
by
Ellen Smith
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1
Answer
+2
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You need to tie the match in to the paper trail. You cannot just assume that the generational calculation given by gedmatch is correct. It is a good starting point for further investigation.
Not clear what you mean by listing the two chromosomes in your question. Are these for the same match?
answered
May 28, 2017
by
Lynda Crackett
G2G6 Pilot
(
674k
points)
Thanks Lynda. i can assume that the 4.6 gen is for chromo 9 a distant ancestor different from the one on chromo 23
but gedmatch doesn t give for the chromo 23 the x the possible generation! coud you explain me why?
You need to do one-to-one comparisons on Gedmatch to see where a pair of people match. And to triangulate, you need to use the one-to-one feature to determine that all three people match with each other on the same segment.
Thanks Ellen
now can someone explain why gedmatch doesn t give the n generation
for a match on the chromo 23
Short answer is that X chromosome inheritance doesn't work the same way as inheritance of other chromosomes.
See the DNA Ancestors feature under Family Tree and Tools for information on the average percentage of X DNA you could have gotten from various ancestors.
i think we can find triangulation on chromo 23 but they are farther : am i correct!
Yes, we can triangulate with chromosome 23, and good matches can exist farther back than with other autosomal chromosomes, but the potential for a good match varies depending on which ancestral branch you are related on.
Thanks Ellen
The big advantage of a match on the X-chromosome is that you can use it to narrow down which lines have potential common ancestors. You can eliminate any line that passes through two consecutive males.
Thanks again but i knew it!
The Wikitree DNA Ancestors page is a great feature. It shows which ancestors could be the source of X chromosome DNA and how much each would contribute (on average).
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