This is a curve that establishes the relationship between the 50% line and the number of markers. As you can easily observe the TMRCA drops very slowly after achieving the 20 marker threshold.
A more detailed explanation and analysis for estimating the Time to the MRCA for the Y chromosome for a pair of individuals can be seen at this page prepared by Dr. Bruce Walsh, our population geneticist and member of our Scientific Advisory Board.
Dr. Walsh has prepared a much more comprehensive analysis -- for people with a statistics background -- and who love to really get into all the details.
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