BLAIR DNA Project
Robert Blair & Isabella Rankin
Robert and Isabella had 7 sons: Matthew, David, John, William, James, Robert, and Joseph.
All six participants tested at least 25 markers. The number of mismatches each had with others is shown in the following table:
Three participants tested at 37 markers. The number of mismatches each had with others is shown in the following table:
The actual marker values for each participant are shown in the table below.
The diagram below show the pedigrees of the six participants based on conventional research.
Participant #5328 and #18895 match the other four participants on only 7 of 25 markers. The probability of mismatching on 18 of 25 markers and sharing a common ancestor within 24 generations is less than 0.00001%.
Participants #5238 or #18895 are haplogroup I2b1 while the others are R1b1b2. There is no way they can share a common ancestor with either #6086, #9084, #26521, or #129948.
The results for the other four participants are still unclear. Participant #9084 seems to be causing most of the confusion.
Participants #9084 and #6086 are believed to share a common ancestor (George Oscar Blair and Clarissa Torrey). There are 7 transmission events (opportunities for a mutation) between the two participants. The expected number of mutations (marker differences) in 7 transmission events is 0.7. The probability of 3 mutations in only only 7 transmission events is less than 3.0%.
At the 37 marker level there about a 50% chance that #9084 and #129448 both descend from Robert and Elizabeth. There is about a 15% probability that #9084 and #26521 both descend from Robert and Elizabeth.
Participants #6086, #26521, and #129948 almost certainly share the common ancestor Robert.
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