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THE GIBBS SURNAME DNA PROJECT
Comparing Test Results
The chart below helps explain how the project participants are related, in terms of distance from each other. As wonderful as it is to find lines that are genetically proven matches, it is also equally important to know who we are NOT related to. By understanding who is most closely related to whom, we are better able to apply the results of the 12-Marker, 25-Marker, 37-Marker, and 67-marker tests to sort out where we should focus our conventional research efforts.
This chart only gives the genetic distance rating and explanations for the 12-Marker testing.
Click these links for: 25-Marker, 37-marker, and 67-marker testing comparisons.
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12-Marker Y-DNA Test Results
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| No. of Matching Alleles |
Genetic Distance |
Relatedness |
Explanation |
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12/12
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0
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Related
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Your perfect 12/12 match means you share a common male ancestor with a person who shares your surname (or variant). These two facts demonstrate your relatedness, however if your name is one of the more common ones (according to official US government records compiled in 1974 "Gibbs" was the 446th most frequently occurring surname in the U.S.A. that year1) then we strongly suggest that you upgrade to the 25-Marker test to eliminate the possibility of a random surname/genetic match. |
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11/12
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1
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Possibly Related
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You share the same surname (or a variant) with another male and you mismatch by only one 'point' on only one marker. For most closely related or same surnamed individuals, the mismatch markers are either DYS 439 or DYS 385A, 385B, 389-1 and 389-2. To ensure that the match is authentic you should refine your test to the 25-Marker level. |
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10/12
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2
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Probably Not Related
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You share the same surname (or a variant) but are off by 2 'points' or 2 locations on just 12 markers. It is only possible that you and another related family member's line each have had a mutation. There are two ways with DNA testing to confirm or deny a relationship. One is to test additional family members to search for a line that shows a mutation that is 1 point closer to your sample. The other is to order the Y DNARefine 13-Marker panel. Refining greatly enhances science's ability to determine relatedness - geared towards the most accurate assessment of the number of generations to a shared ancestor. Only by further testing can you find the person in between each of you ... this 'in betweener' becomes essential for you to find, and in his absence we feel you are probably not related. |
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9/12
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3
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Not Related
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Your 9/12 match, 3-point mismatch is too far off to be considered as related. It is unlikely, but still vaguely possible, that you might share a 'Probably Not Related' status, but absent other evidence, we feel you are not related. |
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8/12
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4
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Not Related
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Your 8/12 match, 4-point mismatch indicates that you are not related, and the odds greatly favor the premise that you have not shared a common ancestor within thousands of years. |
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7/12
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5
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Not Related
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A 7/12 match, 5-point mismatch means you are not related and the odds greatly favor the premise that you have no common ancestor within thousands of years. |
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<7/12
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>5
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Not Related
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You are totally unrelated to this person. |
1 Gibbs Family History, by American Genealogical Research Institute, 1235 Kenilworth Ave, NE, Washington, DC. Published by Heritage Press, Inc., Washington, DC; 1978; p4.
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