i have two questions about bottleneck effect and founder effect. *how are the allele frequencies of the bottleneck populations different to those in the initial populations ? *how would these...

i have two questions about bottleneck effect and founder effect.

*how are the allele frequencies of the bottleneck populations different to those in the initial populations ?

*how would these results compare to a population that had 4 individuals leave to colonize a new population(founder effect). please explain.

Asked on by yanie8888

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orchid101 | College Teacher | (Level 1) Associate Educator

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Fluctuations in population density are very common. These may be annual, long term. Whatever may be their nature, fluactions provide a pivotal point for the occurrence of genetic modifications in the gene pool. When cycles are at their peak, too many individuals are present, the population spreads out far and wide and is exposed to different microenvironments. On the contrary when the population is at an ebb, the number of individuals may reduce to the extent that the small demes constituting the population become isolated and restricted in distribution. This period of crisis with low population density in the species cycle represents in a sense a 'bottleneck' and the changes occurring in the gene ratio during this bottle period constitute the 'bottleneck effect'. When a few individuals or a small group of individuals from some large population invades a new or isolated geographical region, these become the 'founders or founder members'.

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