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 ?
A generation of parthenogenesis is then used to induce an extreme bottleneck effect. Next, sexual crosses were used to study the same types of pre- and postisolating mechanisms that occur in sexual populations (Mayr 1970).
occidentalis populations in Shandong Province would be much less than those of potential source populations because of the founder or bottleneck effects.
Bottleneck effects on average heterozygosity and genetic distance with the stepwise mutation model.