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Our DNA Test Results
|
Project Results - Scientific Allele Values |
1
0
C 4
MODAL
David Blakiston
Tom Blackstone
Richard Guy Blacksten Sr
Michael Leon Blakeston
Christopher John Blackstone
Robert Peter Blackiston
Robert Louis Blackstone
Dan Edward Blackstone
Roy Blackstone
Robert Blackstone (Uncle of Glenda Baker)
James Otto Blackstone III
? Phillip Nesbitt bn 1444 Edrom, SCT.
Herbert Blackson kin of Donna Watson nee Blackson
* Also known as DYS 394
* Mike has had his haplogroup verified via SNP testing.
Understanding the above table:
The figures across the top e.g., DYS 393 represent the individual markers tested. Underneath this against each name are a row of numbers. These represent repetitions of a protein group. Taking the first column and row for David we see DYS 393/13. That is at marker DYS 393 David has a set of proteins which are repeated 13 times. It is these repetitions which alter due to mutations. Either losing or gaining a protein group. In the above I've used David's marker results as a baseline. A deviation of one repetition is indicated in red, of two in yellow & three or more in blue.
To determine a relationship an individuals results are tested marker to marker. The more markers which differ, or the greater the difference in repetitions, the less chance of a relationship. The more markers tested the more sensitive the result to a) confirm a relationship and b) pin down the time frame. A 37 marker test is the gold standard. FTDNA state that a 37:37 match indicates a 100% probability of being related within 24 generations or 600 yrs. Recently a 67 marker test has been introduced. This refines the test eliminating doubts when connections are distant and increasing the accuracy at measuring TMRCA.
The following link leads to a comparison of the study participants results in a simple tabular form. Comparison for a) genetic distance and b) interpretation of that in terms of a 50% or 95% probability of being connected within X number of generations.
Different companies use different marker values and where the above records have markers from SMGF I've amended the results to FTDNA values ie for DYS 452 I've added 19 & for DYS 463 I've added 2.
* Bob & Mike now have some results back from SMGF. This gives them more markers. If others were to take part in this project we could obtain their additional markers, this would aid comparisons.
Understanding the concepts involved in the DNA study have been quite a learning experience for me. Many of them are quite complex and can be daunting. I'm aware that this can put people off and that not everyone wants such details. There are a number of rudimentary concepts that are necessary to one's understanding of the study and I believe will enhance not only one's understanding but pleasure in the study. The following links are my attempt to put these concepts in an easy to understand format. In each are links to more complex explanations for the more brave hearted.
Understanding:
1) The Science:
a)
The DNA tested. click
here
b) How to read the test results. click
here
2) Relationships:
a) Deep and distant ancestry ie Haplogroups & Haplotypes.
click
here
b) Time to Most Recent Common Ancestor (TMRCA). click
here
c) Triangulation. click
here
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