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for SNP Tracker our new SNP is about 1600 years old ... much younger ...Yes, that can be also a scenario
btw .....SNP Tracker added our SNP ....
for SNP Tracker our new SNP is about 1600 years old ... much younger ...
thanks...............where you get your map from...mine is different ...my version is 3/april/2020
You posted the Default Map, ... to view the Full Path you need to Change the Settings:
... click on the last menu tab (top right), an then UNCHECK the “Smooth Path” option.
@Mitty Thank You
SZ1 Tops everyone else SNPs chain for now, by a lot:
... got many more too
I’m a Roman / Hellenic Roman,
any “Labeled” Gallo Roman in me (if any), is ancient common European Ancestry ... imho ... so pay no attention to it.
Very useful information @mitty, thank you.
@Salento SZ1 is kindred of SZ12 SZ24 SZ22 SZ13 SZ7 SZ8 SZ14 SZ6 SZ15 SZ19
Szolad speaking
generally I'm between SZ40 and SZ36,
SZ1 is kind of a Base sample, maybe that's why it has a longer SNPs chain in common with some individuals like me, even though we're different.
I am still amazed and perplexed how you can have so many cM in common with somebody that lived so long ago. I mean this is 2nd-3rd cousin type closeness.Relata refero
(this is the correspondence between the group administrator of Facebook MTA users group and the MTA staff) :indifferent:
I am still amazed and perplexed how you can have so many cM in common with somebody that lived so long ago. I mean this is 2nd-3rd cousin type closeness.
The long shared segments of centimorgans with the people in my deep dive results were bugging me, so I sent an email to the MTA team -
HiLooking at my "deep dive" results, I am confused by the amount of dna I share with ancient people, particularly:
SSG-A4, Viking Gaelic mix, Iceland, 935 AD - Longest segment - 50.38Cm
SGG-A2, Danish Gaelic mix, 935 AD - Longest segment - 17.43Cm
And Cheddar man, Somerset, England, 7150 AD - Longest segment - 16.32Cm
How is this possible, with people who lived so long ago?
Regards, Chrissie.
And received a response the same day -
Simple, a centimorgan is a unit of measurement not intended for ancient people - it is literally defined as a way of comparing 2 people from the similar generations to find recombinant DNA. In fact Centimograns are defined in a very vague way and differ among each testing company in the way they are computed - effectively by taking the SNP length shared and multiplying by a linear factor based on the chromosome. This is why we focus on SNP chain lengths and not centimorgans. SNP length meanwhile is a way of checking how many DNA markers in a row you share with an ancient person with the same exact allele pairs. To share say 100 SNPs in a row with someone means you share the exact same genetic markers (SNPs) with the same exact alleles (A, T, G, C) for 100 values in a row. Mathematically it is incredibly improbable to randomly share such a length - the longer the length the stronger the bond with the sample.
You can do the exact same comparisons on Gedmatch as well if you want - set the minimum SNP length to say 60, and the minimum cM length to say 2 cM, and this enables finding genetic matches to ancient samples. If you set the default of 1500 SNPs and 7 cM, you will not find any cM matches - this is because the definition of cM is really "configurable" and fit for purpose.
Hope this clarifies!
- The MTA Team
How nice of them to take the time to reply, and so quickly.
SZ1 and others, ...
New: SNP chains - no cM
Old: SNP chains + cM
Duarte: Thanks for sharing the responses BigSnake49 and Mitty received from MTA. I have an account over there and this information really helps me understand what is going on with my Ancient matches.
Cheers, hope all is well in your part of the World
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