bottleneck

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A marked decrease in gene pool diversity due to a low number of genetically distinct individuals in the population, i.e., a population bred from 2 individuals has far fewer variables on the allelic loci—a bottleneck—than a second population bred from hundreds of individuals

bottleneck

a period in the history of a population during which the number of individuals is reduced to a low number, perhaps by disease or extreme environmental conditions. As a result RANDOM GENETIC DRIFT may occur in the population. See also FOUNDER EFFECT.
References in periodicals archive ?
Then the intermediate travelers who are already in the queue should keep on waiting and passing through the bottleneck.
High up at the top, climbers risked their lives in two ways; staying and spending the night at the top in disorientation and descending in darkness without rope in the Bottleneck.
This Part will now consider how best to address through policy reform the bottlenecks described above.
Part but not all of why we ought to care about the exclusion of people with past criminal convictions is that this has the effect of making even more pervasive the bottlenecks constraining the opportunities of people from poor, minority communities where various other constraints already make it quite difficult to find jobs.
Some commuters may still arrive at the destination earlier or later than PATI, in order to avoid a long queue at the bottleneck. The cost for commuters traveling from home to the CBD consists of three components: the cost of travel time and the cost of schedule delay early or late.
Hence, the bottleneck on path p1 may fluctuate from one link to another.
The temporal and spatial interactions of travelers by cars and trucks mainly appear in the exit queue part of the bottleneck link.
The bottleneck for the North is that the Federal government has not made a commitment to the high-tech cluster developing around the mining industries of Northern Ontario.
The bottleneck situation should be resolved by April when the seas calm, said Pavel Kushnir, energy analyst with United Financial Group.
If only one bottleneck exists, select an ambush location near where the bottleneck forms, and hunt it only when a favorable wind exists.
The preponderance of evidence supports the bottleneck model.

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