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An Ancestor-descendant relationsip is obviously a relationship between the ancestor and his/her children. On there are two scenarios these are:

Is it true that co-existing populations cannot have an ancestor-descendant relationship? A=yes and

Is it true that co-existing species cannot have an ancestor-descendant relationship? A= no

Also on it says, and I quote "For the purposes of this discussion, a working definition of population can be, a group of interbreeding individuals occupying a certain area, in which the influence on the gene pool from outside the population is minimal. In other words, breeding with individuals from outside is on a much smaller scale compared with breeding between individuals within the population. Now imagine that is is possible to count the number of alleles within this population (= P0) exactly, so that frequence of each can be plotted in the grid:


         A       a
     -----------------
    |        |        |     
A   |   w    |   x    |
    |        |        |
    |--------|--------|
    |        |        |
a   |   y    |   z    |
    |        |        |
     -----------------

For each allele in the population. This would provide a unique fingerprint for this population, at this particular time (= T0). Now, if we allow a certain period of time to elapse and then recount the alleles from the same area at T1, some of the values of w,x,y, and z will have changed. This is due to the removal of some individuals from the population by death or migration, and the addition of some individuals by birth or migration. This change in allele frequence will occur, whether or not natural selection occurs, and is, of course, the standard definition of evolution. Now the relevance of this to the original discussion is that this new population, P1, whilst it differs from P0, it is P0, plus the sum of the changes in allele frequence over the time interval T0 - T1. From this it can be seen that the ancestral population, P0, cannot co-exist with the descendant population P1, because P1 is P0, plus the accumulated changes over time."

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