Results 1 to 2 of 2

Thread: FTDNA Advanced Matches: match in Y-DNA12 and in Family finder in the same time

  1. #1
    Junior Member
    Y-DNA (P)
    mtDNA (M)


    FTDNA Advanced Matches: match in Y-DNA12 and in Family finder in the same time

    Dear collegues,

    I'm David, genealogist from Slovenia. New to DNA research. Please help me with this.

    I'm predicted I-A196 (I-Z140) haplogroup and waiting for SNP test results.
    In FTDNA Advanced matches I have one person with whom I share a match on Y-DNA12 (1 step match) and in the same time also 22 centimorgans on 5th chromosome in Family Finder. He is from UK and he is I-S12289 (I-L338/I-Z140).

    Would this indicate any real ancient connection (common ancestor) or is this just a misleading information (no distant relation at all)?

    Thank you very much for your help!

    Good day to all.


  2. #2
    Registered Users
    English, Irish, German
    Y-DNA (P)

    England Germany Netherlands France Ireland Switzerland
    You have three different tests to determine relatedness:

    1) YSNP - According YFULL, Z140 is 4,000 years old and L338 is 3,000 years old. These are just too old to
    imply a close genealogical relationship as 3,000 or 4,000 is just too old to be very useful for relatedness.

    2) YSTR - At 12 markers, the matches are only 10 to 20 % accurate. Between 8 of 10 and 9 of 10 are
    false hits. You really have to upgrade to a minimum of 37 markers - preferably 67 markers.

    3) atDNA - If you are stating that one segment shared is 22 CM, that is is pretty decent closer relative.
    Variation does vary wildly statistically. According to Bettinger's ranges, here are the best and worst case:

    For the worst case - 0 to 27 CMs - Fourth cousin, twice removed.
    For the best case - 27 to 413 CMs - First cousin, twice removed.

    So your atDNA relatedness is somewhere between these two extremes. It is somewhat lower since
    your largest segment is on 22 CMs vs. 27 CMs. This assumes largest segment vs. overall CM match.

Similar Threads

  1. Replies: 4
    Last Post: 02-04-2018, 02:27 AM
  2. Family Finder Match problem
    By BMG in forum FTDNA
    Replies: 5
    Last Post: 04-06-2016, 05:46 PM
  3. Hoping for a Y-DNA Match from a Family Finder Match
    By rms2 in forum Stevens/Stephens Surname Project
    Replies: 10
    Last Post: 10-31-2014, 03:30 PM
  4. Replies: 3
    Last Post: 04-15-2013, 03:10 AM
  5. Loss of FTDNA Family Finder matches.
    By Eldon in forum FTDNA
    Replies: 1
    Last Post: 08-12-2012, 12:49 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts