population bottleneck


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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.
References in periodicals archive ?
A population bottleneck is an event in which a population undergoes a considerable decrease in size.
This population bottleneck, along with their tendency to marry within the population may have caused some traits or alleles to be more common in a process known as genetic drift.
There is a population bottleneck between Africa and the rest of the world; very few people were involved in the initial migration from Africa," Brandt says.
7 Myr ago, the panda population began to decline due to the two largest Pleistocene glaciations happened in China, and its first population bottleneck occurred at about 0.
An empirical genetic assessment of the severity of northern elephant seal population bottleneck.
The micorsatellite data were examined for evidence of a population bottleneck using BOTTLENECK version 1.
First, we wanted to determine if Sumgayit populations exhibit reduced levels of genetic diversity that could be the result of a population bottleneck.
Those authors concluded that genetie drift associated with a severe population bottleneck (reduction in population size) in Sweden in the 19th century was a probable cause of the observed lack of diversity.
number of ancestors) or a population bottleneck (in which some outside
The outplanting program, however, has unintentionally resulted in a major population bottleneck.
The genetic data suggest an ancient population bottleneck in which animal numbers shrank and then expanded once conditions improved, says anthropological geneticist Natasha Arora of the University of Zurich.
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