Keywords: Retrospective population bottleneck.PNG en Illustration shows a retrospective from the extant population backward in time though a population bottleneck During the period of highest exclusion alleles and their derivatives that entered the bottle neck with the fixed allele and its derivatives are excluded As a result estimating the length of the bottleneck or population size in the bottleneck in excess of the TMRCA is restricted to the age of the TMRCA own Pdeitiker Population genetics Population bottleneck |