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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 25-Marker testing.
Click these links for: 12-Marker, 37-marker, and 67-marker testing comparisons.
25-Marker Y-DNA Test Results |
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No. of Matching Alleles
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Genetic Distance
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Relatedness
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Explanation
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25/25
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0
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Related
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Your perfect 25/25 match means you share a common male ancestor with a person who shares your surname (or variant). These two facts demonstrate your relatedness.
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24/25
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1
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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 and same surnamed individuals, the mismatch markers are usually either DYS 439 or DYS 385A, 385B from our first panel of 12 markers, and on the following from the second panel: DYS #'s 458 459 a 459b 449, 464 a-d, which have shown themselves to move most rapidly. The probability of a close relationship is very high.
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23/25
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2
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Probably Related
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You share the same surname (or a variant) with another male and you mismatch by two 'point' on the 25 markers we tested. For most closely related and same surnamed individuals, the mismatch markers are usually either DYS 439 or DYS 385A, 385B from our first panel of 12 markers, and on the following from the second panel: DYS #'s 458 459 a 459b 449, 464 a-d, which have shown themselves to move most rapidly. The probability of a close relationship is good, however your results show mutations, and therefore more time between you and the other same surnamed person.
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22/25
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3
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Probably Not Related
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You share the same surname (or a variant) but are off by 3 'points' or 3 locations on the 25 markers tested. If enough time has passed it is possible that you and another distantly related family members' line each have had a mutation, or perhaps 2. The only way to prove that is to test additional family lines and find where the mutation took place. Expressed another way, assume your score puts you at 3 on the clock. Assume the person 3 from you is at the 9 position. 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 their absence the possibility of a match exists, but further evidence should be pursued.
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21/25
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4
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Not Related
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This is too far off to be considered related. Unlikely but vaguely possible that the rule for ONLY Possible related applies. It is important to determine what set of result most typifies 'most' members of the group you are 'close' to matching. You may be 21/25 with an individual, but 23/25 with the center (most common) of the group, and your potential relatedness to him is through the center of the group.
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20/25
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5
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Not Related
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You are not related and the odds greatly favor that you have not shared a common male ancestor with this person in excess of 2,000 years.
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19/25
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6
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Not Related
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You are not related and the odds greatly favor that you have not shared a common male ancestor with this person in excess of 5,000 years
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<19/25
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>6
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Not Related
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You are totally unrelated to this person.
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