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 ?
Another north-west England route - the B5159 Warburton Bridge Road in Warburton, Greater Manchester is the third most congested road - being bottle-necked for an average of 86 hours a week.
Finally, the city's roads will further suffer from the increased volume of traffic and so the bottle-necks in the transport network need to be removed' a western bypass from the A45 Allesley to a new M6 junction at Corley would take traffic away from the north west of the city and the north/south road which desperately needs phase three to be completed and join on to the A46.
This strange giraffe certainly brings new meaning to the term bottle-necked.
8GFC will prevent bottle-necks in the point-to-point and loop topologies over copper inside the disk array before they can occur.
The Government's White Paper entitled "delivering a sustainable railway" released on July 24 highlighted both Manchester's Piccadilly and Birmingham's New Street stations' current major "bottle-necks" created since rail privatisation in the mid-1990s.
Through the use of industry-standard Crystal Reports, DLoG's Net Report enables data to be accessed, formatted and distributed in the user's required format simply and effectively--giving fast and accurate visibility of potential manufacturing bottle-necks or other shopfloor problems.
The discussions and deliberations in the seminar would provide an excellent opportunity to identify the impediments and bottle-necks and ways and means for proper soil management, they added.
Believe it or not the solution had been there all the time - it was the human intelligence situated behind the steering wheel of every vehicle that collectively could, every nanosecond, reassess the traffic situation and prevent any bottle-necks from forming.
What makes more sense is to determine where throughput is being bottle-necked within the network.