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Just one number different on 67 marker test

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  • blejerh
    replied
    We have two cousins with a paper trail of being 6th cousins who differ by 1 or 2 numbers on the Y-DNA. It's at least 1 and maybe 2. The Family Finder test confirms the close cousinhood by the way, all us cousins share a large segment on one chromosome.

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  • JohnG
    replied
    How many years

    I took part in a surname project with common male ancestors from 1600's on. The cousins I matched within 1-3 at 67 markers all had common ancestors with me 6-9 generations ago. They all had variant spellings of the same surname.

    I think you have a good chance of having found your male line cousins with a common ancestor in that same time frame, or more recently.

    In one case in our project, a father and son tested and they differed by 1 at 67, so you could be looking at a very recent common ancestor and most of the time the common ancestor is no more than 6-8 generations out.

    My maternal surname has a project and my first and 4th cousins differ by 1 at 67. The common ancestor in that case was born in the 1770s.

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  • efgen
    replied
    Originally posted by madman View Post
    I never said it was 100 generations away you did.

    1-100 is not the same as saying just 100
    Oh for goodness sakes. Fine, you said 1-100, not 100s. Either way, it's still way off and misleading to new customers who are desperately trying to understand what their results really mean.

    If someone asks you how far it is from your house to the nearest supermarket, are you going to tell them it could be 1-100 miles away? Of course not! Is it actually between 1-100 miles away? Certainly. But you would never give someone such a broad answer because it's completely unhelpful. Yet that's exactly what you've done here.

    Elise

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  • madman
    replied
    Originally posted by efgen View Post
    I read past the first line. "100s of generations" is incorrect and misleading for a 66/67 match, no matter how fast or slow the mismatched marker is. If the estimate for 66/67 was 100s of generations, then Y-DNA testing would be completely pointless.

    Elise
    Once again reread because your way off I said it could be any where between 1 generation through 100 which it can and looking at there tree is the only way to dot the lines.

    but most likely its 1-5 it depends on there mutation rate

    I never said it was 100 generations away you did.

    1-100 is not the same as saying just 100

    1-100 means it could be any were between the two for example 5, 10, 12

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  • efgen
    replied
    Originally posted by madman View Post
    I said if there ydna mutates fast no one ever reads past the first line.
    I read past the first line. "100s of generations" is incorrect and misleading for a 66/67 match, no matter how fast or slow the mismatched marker is. If the estimate for 66/67 was 100s of generations, then Y-DNA testing would be completely pointless.

    Elise

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  • Wing_Genealogis
    replied
    Any STR marker can mutate at any time.

    A single mutation over 67 STR markers far outweighs the general consideration about DYS492 typically being a certain value for a certain subclade.

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  • 1798
    replied
    What if one has a value of 12 at DYS 492 and the other has 13? That may mean that they are in separate subgroups.

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  • madman
    replied
    Originally posted by efgen View Post
    Carol,

    Ignore madman's suggestion about "100s" of generations for a 66/67 match. That's just plain wrong.

    Family Tree DNA generally estimates that a 66/67 match will be related within 9 generations, in 95% of the cases.

    You can also get an estimate that takes the specific marker that mismatches into consideration. On your Y-DNA Matches page, click the orange TIP icon next to the match's name.

    Also, if you're talking about a match with the same surname, then that plus the very close 67-marker match absolutely indicates a relationship with genealogical timeframe.

    And if it's not the same surname, that doesn't negate any of this. 66/67 is a very strong match, no matter what surnames the two people have.

    Elise
    I said
    it could be 1 - 5
    if there ydna mutates fast no one ever reads past the first line.

    Leave a comment:


  • efgen
    replied
    Carol,

    Ignore madman's suggestion about "100s" of generations for a 66/67 match. That's just plain wrong.

    Family Tree DNA generally estimates that a 66/67 match will be related within 9 generations, in 95% of the cases.

    You can also get an estimate that takes the specific marker that mismatches into consideration. On your Y-DNA Matches page, click the orange TIP icon next to the match's name.

    Also, if you're talking about a match with the same surname, then that plus the very close 67-marker match absolutely indicates a relationship with genealogical timeframe.

    And if it's not the same surname, that doesn't negate any of this. 66/67 is a very strong match, no matter what surnames the two people have.

    Elise
    Last edited by efgen; 22 July 2013, 02:38 AM.

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  • MasAndPas
    replied
    Thank you everyone

    I guess this is going to take a lot of studying. I am disappointed to see the mentions of 100's of generations. I'm just trying to find generation number 6 on my father's side.

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  • MMaddi
    replied
    Originally posted by madman View Post
    It could be 1 - 100 generations you have to compare trees to find out were they connect it all depends on how fast your ydna mutates if it mutates fast it could be 1 - 5 if its slow then up to a 100.
    I think there's a very small chance that the common ancestor for a 66/67 match is 100 or even 50 generations back. That's a mutation rate that is excruciatingly slow and I doubt anyone has seen one that slow yet.

    Here's what FTDNA gives as a guideline for mismatches at the 67 marker level - http://www.familytreedna.com/faq/answers.aspx?id=9#923 The FAQ terms that close a match as "tightly related." I think the common ancestor is most likely within a genealogical time frame - the last few hundred years.

    Leave a comment:


  • Lincoln
    replied
    Some STR markers change faster than others. On project results pages, they are color coded: http://www.familytreedna.com/faq/answers.aspx?id=7#1359

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  • madman
    replied
    It could be 1 - 100 generations you have to compare trees to find out were they connect it all depends on how fast your ydna mutates if it mutates fast it could be 1 - 5 if its slow then up to a 100.

    Leave a comment:


  • MasAndPas
    started a topic Just one number different on 67 marker test

    Just one number different on 67 marker test

    Can anyone explain to me how close the other person would be to my line. There is only one number that is different.
    Thanks. Carol
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