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 ?
After the fast filling phase, there is a slow fill into the narrower bottle neck to avoid bubbles and foam.
A national on-pack promotion will feature a free Stowells Open Up game on bottle neck tags, posing moral dilemmas to stimulate debate at social occasions.
The 42-year-old,of no fixed abode but who had been living in Dean Road,Wrexham,admitted making threats to kill,affray,and possessing a pair of scissors and a broken bottle neck as offensive weapons.
The report highlighted how the EAU becomes a bottle neck with patients coming in and being treated but unable to move on to main hospital wards because of a lack of beds.
It is added at the point of sale so that the bottle neck is more hygienic.
The over sizing of the crushing plant has been made in order to permit future flexibility in the management of the Tabakoto production program to be able to increase future milling rates with less need to re-design the crushing plant - which is often a bottle neck in mill expansion programs.
Singha Beer was recently repackaged from a stub bottle to a long bottle neck shape with a new label, as part of the company's attempt to gain a more trendy image.
To us, the romance of wine arises from the sensual pleasure of its aromas,flavours and textures, not from the smelly piece of bark inserted in the 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.
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.