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67 marker MCRA

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  • 67 marker MCRA

    I didn't see where the upgraded MCRA calculations for the 67 marker test are located.

    I have a match on the 67 level - with a genetic difference of 5. This same match was a genetic distance of 3 - at the 37 marker level.

    Can someone point me to the right spot?

    Thanks!
    Charles Coons

  • #2
    Charles, I don't believe FTDNA has added that, yet. I saw a message somewhere...can't remember where at this time...back in June saying FTDNA would be revealing the mutation rates for the new panel this month. Calculating the rate is a prerequisite to calculating a MRCA. With the delays I've noted in people getting results back for the upgrade it would not surprise me in the least if the release is pushed back a bit.

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    • #3
      If you really need an answer, you can use third-party MRCA calculator (like http://www.moseswalker.com/mrca/calculator.asp?q=1 ).

      Enter "67" for the number of markers and make a wild guess for the mutation rate (which, as DMac pointed out, hasn't be released). I'd use a number closer to 0.004 than 0.002.

      You've got a 50% probability of having a common ancestor within 11 generations, I think, with a 62/67 match.
      Last edited by vineviz; 24 July 2006, 03:28 PM.

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      • #4
        Cool link!

        If I recall correctly - a change from one allele of 19 to 21 would count as 2 for genetic difference purposes, but it would only count as 1 for for the MCRA calculation?

        It's still pretty exciting - I *knew* great great great granddad didn't just spring from the earth!

        Thanks!
        Charles Coons

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        • #5
          If you go to FTDNA home page, where you sign in, and click FTDNAtip you can calculate the generations back from your testors parent and get a general idea through percentages. It also tells you the percentage for genetic differences. I'm 3 off at 67 from same surname cuzes and I know from 1820 to 1890 there was no MRCA so I figure I have to go back at least 8 generations to find him.

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          • #6
            There's a TIP comparision at 12 markers, 25 markers, and 37 markers, but I don't see one for 67 markers yet. (With the only 67 match I have, so far.)

            I don't see another spot to click. Hmm.

            I'll just keep checking. I'm sure it will be out "soon".

            Thanks!
            Charles Coons

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            • #7
              Originally posted by CharlesC
              Cool link!

              If I recall correctly - a change from one allele of 19 to 21 would count as 2 for genetic difference purposes, but it would only count as 1 for for the MCRA calculation?
              I was taught the the change from 19 to 21 also counts as 2 for calculating TMRCA.

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