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 ?
An outer ring on the nipple that grabs the bottle neck and seats the nipple in the correct orientation.
The fast fill phase in the generally cylindrical part of the bottle is started after the plastic bottle has been positioned under the filling valve and is followed by the low-foam, slow filling phase in the narrow bottle neck.
SIG has developed a sliding sleeve that glides over the blow pin, giving the bottle neck a smoother surface comparable to a PET container, Andrich claims.
Contract awarded for 2014 Pine jaeseonchung bottle neck damage removal business (samjeongja Earth)
The bottle neck has also been tweaked for the wines' switch to screwcap closures.
The Scorpion bottle neck gripper keeps the bottle centralised under the filling nozzle and locates the bottle on the bottle platform.
The boundary stone wall of the 14th century St James' parish church at Audlem, near Nantwich, causes a serious bottle neck for traffic.
After blowing, before the bottles have fully cooled, the blow pins retract and are re-inserted only a few millimeters into the bottle neck.
This new solution represents the next quantum leap for mobile phones by addressing the bottle neck in transmission quality and making data traffic significantly more reliable and consistent.
shape, dimensions and interior surface of the bottle neck) and to the method used to introduce the stopper in the bottle neck (i.
The new range includes a unique low-profile version which fits all SP-400 bottle neck finishes; uses less material; is simpler and cheaper to manufacture, and can be fitted to SP-400 finishes simply by adding low-profile 'loks' which can be blow- or injection-moulded into the neck finish.