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  • Question on Genetic Distance

    Please, I need some expert advice.

    I am blocked at 1805 in finding my ancestors. I have taken a 37 marker test and the result show the following markers that differ with 3 other people tested.

    The different markers of 37 tested are:
    Me - 11 13 30 12 17 18
    Person # 1 – 12 14 31 12 16 19
    Person # 2 – 12 14 31 13 16 18
    Person # 3 – 12 14 31 12 15 18

    According to published results, the common male ancestors for person 1 and 2 are as follows:
    Generation # 1 - 1606
    Generation # 2 - 1657
    Generation # 3 - Person 1 - 1689 / Person 2 - 1687.

    The results show that Persons 2 has a 90% chance of having a common ancestor with both Persons 1 and 3, in 12 generation or about 1706, assuming 25 years per generation.

    The published genealogy results for persons 1 and 2 shows they have a common ancestor born in 1657 but have different parents in 1687 & 1689.

    The results also show that I have a 90% chance of having a common ancestor with person # 3 in 15 generation (or about 1631) and further back to 18 and 19 generations with persons 1 and 2 respectively. However, some web site say that a genetic different of 5 with 37 marker test there would be NO family relationship.

    My question is: Do the results suggest that I not have a common ancestor any of the three people also tested?

    Thanks

  • #2
    Originally posted by Steve Button
    Please, I need some expert advice.

    I am blocked at 1805 in finding my ancestors. I have taken a 37 marker test and the result show the following markers that differ with 3 other people tested.

    The different markers of 37 tested are:
    Me - 11 13 30 12 17 18
    Person # 1 – 12 14 31 12 16 19
    Person # 2 – 12 14 31 13 16 18
    Person # 3 – 12 14 31 12 15 18

    According to published results, the common male ancestors for person 1 and 2 are as follows:
    Generation # 1 - 1606
    Generation # 2 - 1657
    Generation # 3 - Person 1 - 1689 / Person 2 - 1687.

    The results show that Persons 2 has a 90% chance of having a common ancestor with both Persons 1 and 3, in 12 generation or about 1706, assuming 25 years per generation.

    The published genealogy results for persons 1 and 2 shows they have a common ancestor born in 1657 but have different parents in 1687 & 1689.

    The results also show that I have a 90% chance of having a common ancestor with person # 3 in 15 generation (or about 1631) and further back to 18 and 19 generations with persons 1 and 2 respectively. However, some web site say that a genetic different of 5 with 37 marker test there would be NO family relationship.

    My question is: Do the results suggest that I not have a common ancestor any of the three people also tested?

    Thanks
    Well, I am not a master at this, BUT I am having similar issues with my group. According to my results I am not who I thought I was and there is no possible way of my having a relationship (dna wise) with the people whom claim have the same immigrant ancestor as I.

    That being said, do you have a paper trail of birth certificates or documentation that leads you to your ancestor? Second, I have found that in the science world a generation is defined mathematically by 25 years. In MY documented world, 12 generations takes me back to 1603- 15 generations might take you back a lot farther than what you have. We also cannot tell which markers that you are comparing, some markers mutate faster than others.

    There is a chart that ftdna has listed under ftdna tip that will explain marker differentials with regard to relationship possibilities. I believe a gen. diff. of five in a 37 still leaves open a possibility (unlikely but possible) that you share a common ancestor. Do your haplogroups match? If they do and you have the same surname and have paper trails I would not give up hope.

    I am not convinced that this science is infallible, I know of some people who are siblings that share a diff of 2, and a father and son who differ with 1. I don't believe that we fully understand how and when genes mutate.

    Cheers.

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