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  #1  
Old 17th July 2017, 02:45 PM
Joel Hill Joel Hill is offline
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Is there a particular significance to

Being a perfect match with someone other than being off by 1 with DYS442 being the difference??

Thanks
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  #2  
Old 18th July 2017, 09:17 AM
Jim Barrett Jim Barrett is offline
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How many markers did each of the two people test for?
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  #3  
Old 23rd July 2017, 11:02 AM
Joel Hill Joel Hill is offline
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I tested

At 37 and 67....
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Old 25th July 2017, 08:23 AM
spruithean spruithean is offline
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I don't think a mismatch at DYS442 is super significant, unless there is new information on the mutation rates of DYS442.
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  #5  
Old 25th July 2017, 10:03 AM
John McCoy John McCoy is offline
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Even if there were new information about the mutation rate of one STR, unless the mutation rate were incredibly high (in which case this STR would have been too unstable to be selected for use in the Y STR panels in the first place), the significance is still the same: One sample is different from another, by one step, as a result of a random mutational process of some kind. Mutation rates tell you about probabilities and averages, but they don't tell you precisely at which generation a mutation occurred (unless you happen to have other evidence). A genetic distance of 1 between two samples from a Y-67 test strongly suggests, but does not prove, a genealogical relationship within a genealogically significant time frame. The "TiP" report will suggest a range of generations.
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