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  • understanding SNPs

    Previously I had been ascribed an SNP=176.1 and had several matches with 67 STRs with 5-6 differences. I had additional tests which reallocated me to YP274 where I have no matches. In the latest haplotree L176 is no longer there except for a pop up box. On a Google search I found a tree which placed YP274 upstream of 176.1. I have understood that an SNP can be interpreted as a sub tribe or cluster from which my ancestor came and hence only needed to consider STR matches within this SNP group to find an ancestor. If I have no matches how did the lab find it - from ancient bones or deduced from theory? Please can someone confirm my assumptions or put me straight.

  • #2
    Many different STR signatures will belong to the same haplogroup subclade (share same terminal SNP), but each will not be related in a genealogical timeframe.
    STR signature matches will be more genealogically related (with in the last 1000 years).
    YP274 is said to be formed 2400ybp
    https://www.yfull.com/tree/R-YP275/

    There are currently many more subclades below YP274 which you could fall into (unless you have done Big Y already and that is as deep as you go), which within the genealogical timeframe.

    Matches are not matched based on SNP, but STR, both go hand and hand, but STR matching will contain more recent common ancestors then SNP value will.

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    • #3
      Thank you for reply .It is very helpful but my geriatric wits are still not quite with it. I have a connection with Clan Donald in Scotland but am not a Scot. On their website they quote YP276 as 2600 ybp,YP280 as 2300 ybp and say'an intermediate cluster of YP274,275 and L176 lies between these(cf 2400 you quoted which is comforting). It contains many SNPs which implies some very small populations bore these markers.' I don't understand what they mean by many SNPs -3?500?. Can a cluster contain more than one SNP? and is this still a sub clave?

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