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Defintion Confusion

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  • Defintion Confusion

    Just when I thought I had sorted out the differences between "derived" and "ancestoral" I got myself all messed up again.

    I started re-reading Wells "Deep Ancestry" book and on Page 41, 1st paragraph towards the bottom he writes "...since each letter is derived from an older version to a T ... we often denote them as positive for the derived state ... or negative ...."

    In other readings (as I am doing my best to understand DNA and as many aspects of it I can) I understood "derived" to be something calculated mathematically and "assumed" without further evidence but "ancestoral" was a stronger connection because it was "inherited" so the links to the past are therefore better and more accurate.

    Could someone help straighten me out??!! Having M222+ I thought this was ancestoral but is that now "derived"? How do these two terms actually differ?


  • #2
    Derived=positive for the SNP and ancestral=negative for the SNP.

    If you are M222+, it means that you have the SNP, which occurred at some time x thousands of years ago and sets the original man in whom the SNP occurred apart from the rest of R1b-M269 at that time. As well, all the male direct descendants of that man are M222+ and are set off from the rest of R1b-M269 since then and today. (R1b-M269 had the ancestral state and was the haplogroup subclade of the father of the man who had the M222 SNP.)


    • #3
      Mike explained it quite well. Ancestral means the older pattern, that is, the pattern before the new mutation in question occurred. Derived means the newer pattern after the mutation happened.


      • #4

        Thank you for the help and clarifying it for me - somehow I got it twisted and then it began not to make sense the more I tried to see around it - appreciate the clear feedback - thanks!


        • #5
          Biology terms...

          The terms "ancestral" & "derived" are used in evolutionary biology. They replaced older terms such as "primitive"(now ancestral).