http://SaturnianCosmology.Org/ mirrored file For complete access to all the files of this collection see http://SaturnianCosmology.org/search.php ========================================================== http://www.andaman.org/BOOK/originals/Weber-Toba/ch5_bottleneck/textr5.htm http://www.andaman.org/BOOK/originals/Weber-Toba/ch5_bottleneck/textr5.htm The branching off of a new species from a pre-existing older population can also be defined as a bottleneck and leaves a similar genetic traces in a population. Species normally develop over long periods and in that time they accumulate genetic variations in their population. While a bottleneck can be identified in the genome of a population, it is difficult to determine its intensity and duration: a severe bottleneck leaves a similar imprint from a longer, less severe event (ref. Relethford et al., 1994). Still more difficult is it to identify the date when a bottleneck has taken place. Dating a perceived bottleneck is largely a question of searching through time for a possible cause and then trying to determine whether the available evidence fits the suspected cause.