GENEALOGICAL DNA TEST RESULTS

Ben H. Swett
Colonel USAF (Retired)
9 March 2007

The Sweet-Swett-Sweat DNA project now has ten participants named SWETT. Their lineages are in Table 1. Their test results are in Table 2 and Table 3. Further information is at the bottom of this page.

These are y-chromosome DNA tests, so they only address biological descent in the male line. They measure the lengths of specified markers on the y-chromosome. The measured results are interpreted statistically to show with a stated probability whether any two or more participants have a common male ancestor, and if so, the number of generations back to their most recent common male ancestor.

Table 1 -- LINEAGE OF PARTICIPANTS
(Names of participants are used with their permission)

1
John Swett of Newbury
c1590
England
2
Stephen
1620
England
Benjamin
1624
England
3
 John
1648
MA
Joseph
1659
MA
John
1670
NH
Stephen
1673
NH
4
Samuel
1680
MA
Benjamin
1688
MA
Benjamin
1710
NH
Jonathan
1712
NH
Nathan
1711
NH
Joseph
1701
MA
John
1703
MA
Moses
1705
MA
5
Benjamin
1713
MA
Eliphalet
1716
MA
Moses
1738
NH
Joseph
1739
NH
Josiah
1741
NH
Nathan Jr
1739
NH
Abraham
1742
MA
Stephen
1727
MA
Stephen
1734
NH
6
William
1739
CT
William
1773
MA
Daniel
1763
NH
Josiah
1763
ME
Jonathan
1780
MA
Josiah Jr
1768
MA
Abiel
1766
MA
Daniel
1772
MA
John
1765
ME
Samuel
1765
NH
7
Samuel
1774
ME
Benjamin
1811
MA
Benjamin
1805
ME
Joseph
1791
ME
Joel R
1808
MA
Josiah III
1814
NH
Moses B
1805
NH
Daniel Jr 1804
MA
Harvey
1810
ME
Winborn
1786
ME
8
Charles G
1801
MA
Franklin
1842
WI
Daniel E
1836
NH
Oliver P
1835
IL
Lyman R
1859
IL
Josiah IV
1857
VT
Frederick
1845
NH
Charles
1828
DC
Sumner
1852
ME
James H
1828
ME
9
Charles
1831 
Ecuador
Herbert
1864
WI
Perley E
1888
NH
Fred E
1885
NE
Trevor
1893
NJ
Paul P
1882
CT
Clyde
1887
MO
Charles J
1855
MS
Leon P
1875
ME
James W
1857
ME
10
Jorge
1868
Peru
Ben H
1934
WI
Harvey
1912
NH
Everett Drake*
1908 NE
Trevor Jr
1925
Latvia
Paul Jr
1909
CT
Clyde Jr
1918
CO
Charles L 1892
MS
Raymond
1910
ME
Ernest C
1886
ME
11
Alberto
1903 Ecuador
 
David W
1948
NH
Gary Drake*
1936 CA
 
Steven C
1934
CT
Keith
1950
OH
Charles R 1926
MI
 Raymond Jr
1946
ME
Harris H
1929
ME
12
Francisco
1947 
Ecuador
 
 
 
 
 
 
Charles M 1949
MI
 
 Keith J
1960
MA
*Gary Drake's father, Everett Drake, was a son of Fred E. Swett, adopted by Cecil Drake

Table 2 -- 25 MARKER DNA TEST RESULTS
(Results for John Swett of Newbury are estimated from his descendants)

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
DYS
Locus
3
9
3
3
9
0
1
9
3
9
1
3
8
5
a
3
8
5
b
4
2
6
3
8
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
John SWETT
of Newbury
13
23
14
10
11
14
12
12
11
13
13
29
18
8
10
11
11
24
15
19
31
14
14
15
17
Trevor
13
23
14
10
11
14
12
12
11
13
13
29
18
8
10
11
11
24
15
19
31
14
14
15
17
Steven
13
23
14
10
11
14
12
12
11
13
13
29
18
8
10
11
11
24
15
19
31
14
14
15
17
Gary
13
23
14
10
11
14
12
12
11
13
13
29
18
8
10
11
11
24
15
19
31
14
14
15
17
David
13
23
14
10
11
14
12
12
11
13
13
29
18
8
10
11
11
24
15
19
31
14
14
15
17
Ben
13
23
14
10
11
14
12
12
11
13
13
29
18
8
10
11
11
24
15
19
32
14
14
15
17
Keith
13
23
14
10
11
14
11
12
11
13
13
29
18
8
10
11
11
24
15
19
31
14
14
15
17
Francisco
13
23
14
10
11
14
12
12
11
13
13
29
18
8
10
11
11
25
15
19
31
14
14
15
17
Charles
13
23
14
10
11
15
12
12
11
13
13
29
18
8
10
11
11
24
15
19
31
14
14
15
17
Raymond
13
23
14
10
11
14
12
12
11
13
13
29
18
8
10
11
11
24
15
19
31
14
14
14
17
Keith J
13
23
14
10
11
14
12
12
11
13
13
29
18
8
10
11
11
24
15
19
30
14
14
15
17

Trevor, Steven, Gary and David have an exact 25/25 match. Ben, Keith, Francisco, Charles, Raymond and Keith J. match them exactly on 24 of 25 markers -- and they each have a different one-step mismatch. This means it is very likely that the first four men have the DNA profile (haplotype) of John Swett of Newbury himself, and it is very likely that the other six men would match John Swett of Newbury exactly on 24 of 25 markers with 1 one-step mismatch.

24 exact matches with 1 one-step mismatch means:
99.9% probability the participants have a common male ancestor
90% probability their most recent common male ancestor is 20 generations or less (500 years or less)
95% confidence interval their most recent common male ancestor is 1-28 generations (more than 25 years and less than 700 years)

The participants' lines of descent from John Swett of Newbury (Table 1) show the following generations and years:
Trevor = 10th generation, 335 years
Steven = 11th generation, 344 years
Gary = 11th generation, 346 years
David = 11th generation, 358 years
Ben = 10th generation, 344 years
Keith = 11th generation, 360 years
Francisco = 12th generation, 357 years
Charles = 12th generation, 359 years
Raymond = 11th generation, 356 years
Keith J = 12th generation, 370 years

Taken together, their genealogy and DNA test results prove beyond reasonable doubt that these ten men and their direct lines of male Swett ancestors are descendants of John Swett of Newbury.

Further, these results provide a DNA profile (haplotype) by which other men who choose to participate in any DNA test that uses the same markers can prove with a high degree of confidence whether they are or are not related to John Swett of Newbury.

Table 3 -- TWO SEPARATE FAMILIES
(Results are estimated from their descendants)

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
John SWETT
of Newbury
13
23
14
10
11
14
12
12
11
13
13
29
18
8
10
11
11
24
15
19
31
14
14
15
17
John SWEET
of Salem
13
24
14
10
11
14
12
12
12
14
13
30
18
9
10
11
11
25
15
19
29
15
15
17
18
DISTANCE = 13
 
1
           
1
1
 
1
 
1
     
1
   
2
1
1
2
1

A major finding of the Sweet-Swett-Sweat DNA project is that participating descendants of John SWETT of Newbury and participating descendants of John SWEET of Salem (settled in Rhode Island and Connecticut) do NOT have a common male ancestor in the last 3,000 years. Although SWETT has often been described as a variant of SWEET, these DNA test results prove they are two separate families.

FURTHER INFORMATION

The Sweet-Swett-Sweat DNA project website explains the rationale and plan of action. http://www.fairleafarm.us/dnasweet.htm

Anyone interested in participating should email John Chandler <john.chandler@alum.mit.edu> and put "Sweet-Swett-Sweat DNA" in the subject line. You can ask him questions and/or ask him to sign you up for the project. He can explain the project and DNA testing better than I can, and if you decide to participate, he will contact the testing agency and make the arrangements. I recommend the 25 marker test because it is significantly more accurate than the 12 marker test. When the test kit arrives in the mail, it will contain instructions and an invoice. The discounted price for the 25 marker test was $169 plus postage when I signed up. I thought it was somewhat expensive, but now I believe it was a very worthwhile investment.


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