Part 523r – Smith Robertson Genealogy – Robertson FTDNA Y-DNA 111 - DYS Values Returned

09 June 2011

Greetings,

The first set of the Robertson DNA Y-Chromosome Segment (DYS) values have been returned. These are the results of the Robertson Family Tree DNA Y-DNA 111 markers tests. I have included all results in the following listing. But in order to understand what you are looking at, I have found some definitions that may help.

LocusA specific spot in the genome. A variable locus will have several possible alleles. (From Family Tree DNA)

DYS#DNA Y-Chromosome Segment (DYS): A nomenclature system which assigns DYS numbers to numbers to newly discovered markers. They are the “names” of each marker. (From Family Tree DNA)

AllelesOne of the different forms of a gene that can exist at a single locus. Since mutations in the allele value occur very slowly with time, one should see the same allele value for a male and his great-grandfather for example. (From Family Tree DNA)

The theory and idea is that one should be able to compare one’s DYS values to other individuals to see how closely or distantly one may have shared a common ancestor. The more DYS markers’ alleles match between two individuals, with the same or variation of a similar surname, the greater the probability that the two individuals may share a common ancestor. (But of course, there could be a chance that the two individuals do NOT share a same surname due to some earlier incidence as adoption, name change, etc..)

The supposed example would be that as any immediate Robertson male relative who shares the same grandfather, Frederick Henry Robertson, one would expect that anyone of them would have the similar allele results. And here are the 111 results.


Locus

1

2

3

4

5

6

7

8

9

10

11

12

DYS#

393

390

19

391

385a

385b

426

388

439

389-1

392

389-2

Alleles

13

24

15

10

11

14

12

12

11

12

13

28


Locus

13

14

15

16

17

18

19

20

21

22

23

24

25

DYS#

458

459a

459b

455

454

447

437

448

449

464a

464b

464c

464d

Alleles

19

9

10

11

11

25

15

19

30

15

15

17

18


Locus

26

27

28

29

30

31

32

33

34

35

36

37

DYS#

460

GATA H4

YCA IIa

YCA IIb

456

607

576

570

CDYa

CDYb

442

438

Alleles

11

11

19

22

15

15

17

16

38

39

12

12


Locus

38

39

40

41

42

43

44

45

46

47

DYS#

531

578

395S1a

395S1b

390

537

641

472

406S1

511

Alleles

11

9

15

16

8

10

10

8

10

11


Locus

48

49

50

51

52

53

54

55

56

57

58

59

60

DYS#

425

413a

413b

557

594

436

490

534

450

444

481

520

446

Alleles

12

23

23

16

10

12

12

15

8

12

22

20

13


Locus

61

62

63

64

65

66

67

DYS#

617

568

487

572

640

492

565

Alleles

12

11

13

11

11

13

12


Locus

68

69

70

71

72

73

74

75

DYS#

710

485

632

495

540

714

716

717

Alleles

37

15

9

16

12

27

26

19


Locus

76

77

78

79

80

82

83

84

85

DYS#

505

556

549

589

522

494

533

636

575

638

Alleles

12

12

13

12

10

9

12

12

10

10


Locus

86

87

88

89

90

91

92

93

DYS#

462

452

445

GATA A10

463

441

GGAAT 1B07

525

Alleles

11

30

12

14

24

14

10

10


Locus

94

95

96

97

98

99

100

101

102

DYS#

712

593

650

532

715

504

513

561

552

Alleles

20

15

19

12

24

16

12

15

24


Locus

103

104

105

106

107

108

109

110

111

DYS#

726

635

587

643

497

510

434

461

435

Alleles

12

23

18

10

14

17

9

12

11

To date we have received notification from Family Tree DNA that there is another Robertson who may match to these results, with a Genetic Distance of 10.

A Genetic Distance, as defined by Family Tree DNA - Genetic Distance is the number of differences, or mutations, between two sets of results. A genetic distance of zero means there are no differences in the results being compared against one another, i.e., an exact match. This is the meaning when comparing Y-chromosome DNA or mitochondrial DNA. This is the computed total, from what I understand of the differences be the alleles from two different test participants. In other word if our Robertson Locus 94 of DYS #712 scored "20" and the other Robertson's Locus 94 of DYS #712 scored "30", the difference between 20 and 30 is equal to a Genetic Difference of 10.

In the current matching case with our Robertson and the other Robertson participant, the Genetic Distance can be written to say that based on the results there is a greater than 99% chance that there may be a common ancestor at about 28 generations or around the year 1300, give or take a few years. And now both sides just have to find the corroborating documentation... and because of the year this in not a small feat.

Enjoy,

Jim

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