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 ?
The limited number of specialists available for the prescription of ethical products has an additional bottleneck effect on potential revenues that could be generated in the ophthalmic market," remarks Mkandawire.
Given the recurrent oil and coal price spikes as well as the power shortages nationwide, energy, and energy uncertainty, is increasingly having a bottleneck effect on China's economy.
Solar energy becomes the new hope for China's energy resources: Given the recurrent oil and coal price spikes as well as the power shortages nationwide, energy is increasingly having a bottleneck effect on China's economy.