• This graph shows ten different populations, each consisting of two individuals.

  • Initially, each population has p = 0.5 and q = 0.5

  • Each population might take a different time to become "fixed" at one allele or the other, but all of them eventually do.

  • For example, due to sampling error, two of the populations become fixed at "a" in only one generation. Two more take two generations.

  • Note that the "4" on the diagram is the total number of alleles in the population, since each individual has two.

  • The populations that eventually go to "0" frequency for the a allele have become fixed for the "A" allele.