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  • JSW
    replied
    RE What types of variations are normal, or acceptable with the mutating markers. And are the mutating markers the same ones... i.e. 385a, 385b.... etc.

    The problem is it is all "statistical" and "narmal" has such a
    wide range.
    In any given family genealogy the mutating markers are still
    random - or at least that is the thinking.

    Also for every 14 births you can count in the proposed family tree
    about one mutation will be seen (but "normal" is 0 to 2)
    So theroize an MRCA and a number of births up to the men tested

    With 10 men and an MRCA in 1800 and an estimate of 60
    births will get from 1 to 6 mutations [90% of the time]

    Leave a comment:


  • Barra
    Guest replied
    Excellent progress. Many thanks.

    Lets add this to the equation. 25 marker test of one surname, an typical Irish surname, Rb1 type folk.... fairly well established family; at least 10 men participating in the Y chromosome test...

    What types of variations are normal, or acceptable with the mutating markers. And are the mutating markers the same ones... i.e. 385a, 385b.... etc.

    enlighten this poor soul...

    Leave a comment:


  • B52
    replied
    25 markers - 99% within 1000 years without needing surname
    (more or less since the adoption of surnames in Europe)

    12 markers - 99% within 2500 years without needing surname

    With a matching surname, mutations can be introduced knowing that the surname is increasing the probabilty of relatedness that the mutations decreased in probabilty...like a tug of war.

    Best Regards,
    John

    Leave a comment:


  • Barra
    Guest started a topic Basics Please...

    Basics Please...

    In the 25 marker test.... how many must match to point to a common ancestor? At what point do you say, 'sorry son!'

    Hopefully that was will get an answer of six words or less!

    Also... on the fast mutating markers, is a mis match on those to be expected? I take it the more of these that mis-match the greater the time to a common ancestor (if there is one).

    So anyone with a little time.... shoot me full of the basics. cut down to the mere facts.

    a thousand and one thanks.... go raibh mile maith agaibh...
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