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population bottleneck

   Also found in: Wikipedia 0.01 sec.
population bottleneck [‚päp·yə′lā·shən ′bäd·əl‚nek]
(evolution)
Genetic drift that occurs as a result of a drastic reduction in population by an event having little to do with the usual forces of natural selection.


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Depending on the causes of the population bottleneck, the numbers of individuals in the population may recover rapidly, but the lost alleles can only be replaced by mutation or immigration from other populations.
While properties for sale in the coastal Var region (cities like Toulon, Brignoles and Frejus) are more affordable, the downside is a population bottleneck on the roads, especially in early summer, owing to a heavy influx of tourists.
What the exhibit leaves out is that even this finding may as easily be the result of a founder effect or population bottlenecks, which amplify differences in gene frequencies among groups that were once similar, as of any ancient ethnic difference between founding populations.
 
 
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