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Conventional Research
The Robert Blair - Isabella Rankin line is one of the most researched line
in the BSGR. Thirty-six past and present members claim to descend from
this line. The line predates the American Revolution.
Robert and Isabella had 7 sons: Matthew, David,
John, William, James, Robert, and Joseph.
DNA Testing
We have six paricipants who believe they descend from the
Robert Blair - Isabella Rankin
line. Four descend through son Matthew,
while two descend through son David.
The four who descend from Matthew descend through three different sons:
Jacob, Isaac, and Adam.
All six participants tested at least 25 markers. The
number of mismatches each had with others is shown in the following table:
| 25 Marker Mismatches |
| |
5328 |
18895 |
26521 |
129948 |
6086 |
9084 |
| 5328 |
|
0 |
18 |
18 |
18 |
18 |
| 18895 |
0 |
|
18 |
18 |
18 |
18 |
| 26521 |
18 |
18 |
|
1 |
1 |
4 |
| 129948 |
18 |
18 |
1 |
|
0 |
3 |
| 6086 |
18 |
18 |
1 |
0 |
|
3 |
| 9084 |
18 |
18 |
4 |
3 |
3 |
|
Three participants tested at 37 markers. The number of
mismatches each had with others is shown in the following table:
| 37 Marker Mismatches |
| |
26521 |
129948 |
9084 |
| 26521 |
|
2 |
5 |
| 129948 |
2 |
|
3 |
| 9084 |
5 |
3 |
|
The actual marker values for each participant are shown in the table below.
| Marker |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
30 |
31 |
32 |
33 |
34 |
35 |
36 |
37 |
| |
DYS# |
PART ID# |
3 9 3 |
3 9 0 |
1 9 * |
3 9 1 |
3 8 5 a |
3 8 5 b |
4 2 6 |
4 3 8 |
4 3 9 |
3 8 9 i |
3 9 2 |
3 8 9 ii |
4 5 8 |
4 5 9 a |
4 5 9 b |
4 5 5 |
4 5 4 |
4 4 7 |
4 3 7 |
4 4 8 |
4 4 9 |
4 6 4 a |
4 6 4 b |
4 6 4 c |
4 6 4 d |
4 6 0 |
G A T A H 4 |
Y C A II a |
Y C A II b |
4 5 6 |
4 0 7 |
5 7 6 |
5 7 0 |
C D Y
a |
C D Y
b |
4 4 2 |
4 3 8 |
| Matthew Blair |
| 5328 |
15 |
24 |
15 |
10 |
15 |
16 |
11 |
13 |
11 |
13 |
12 |
28 |
16 |
8 |
9 |
11 |
11 |
25 |
15 |
20 |
28 |
11 |
11 |
14 |
15 |
|
|
|
|
|
|
|
|
|
|
|
|
| 18895 |
15 |
24 |
15 |
10 |
15 |
16 |
11 |
13 |
11 |
13 |
12 |
28 |
16 |
8 |
9 |
11 |
11 |
25 |
15 |
20 |
28 |
11 |
11 |
14 |
15 |
|
|
|
|
|
|
|
|
|
|
|
|
| 26521 |
12 |
24 |
14 |
11 |
11 |
15 |
12 |
12 |
12 |
13 |
13 |
29 |
14 |
10 |
10 |
11 |
11 |
26 |
15 |
19 |
30 |
14 |
15 |
17 |
17 |
11 |
11 |
19 |
23 |
15 |
17 |
19 |
17 |
35 |
38 |
12 |
12 |
| 129948 |
12 |
24 |
14 |
11 |
11 |
15 |
12 |
12 |
12 |
13 |
13 |
29 |
15 |
10 |
10 |
11 |
11 |
26 |
15 |
19 |
30 |
14 |
15 |
17 |
17 |
11 |
11 |
19 |
23 |
15 |
16 |
19 |
17 |
35 |
38 |
12 |
12 |
| David Blair |
| 6086 |
12 |
24 |
14 |
11 |
11 |
15 |
12 |
12 |
12 |
13 |
13 |
29 |
15 |
10 |
10 |
11 |
11 |
26 |
15 |
19 |
30 |
14 |
15 |
17 |
17 |
|
|
|
|
|
|
|
|
|
|
|
|
| 9084 |
12 |
24 |
14 |
11 |
10 |
15 |
12 |
12 |
12 |
13 |
13 |
29 |
15 |
9 |
10 |
11 |
11 |
26 |
15 |
19 |
31 |
14 |
15 |
17 |
17 |
11 |
11 |
19 |
23 |
15 |
16 |
19 |
17 |
35 |
38 |
12 |
12 |
The diagram below show the pedigrees of the six participants based on conventional research.
Conclusions
Participants #5328 and #18895 match 25/25 but share a common
ancestor in 3 transmission events. With only 3 such transmission
events you expect to have a perfect match.
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%.
There is no way #5238 or #18895 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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