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Population bottleneck followed by recovery or extinction. A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as genocide, speciocide, widespread violence or intentional culling.
In population genetics, the founder effect is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population. It was first fully outlined by Ernst Mayr in 1942, [ 1 ] using existing theoretical work by those such as Sewall Wright . [ 2 ]
The information bottleneck method is a technique in information theory introduced by Naftali Tishby, Fernando C. Pereira, and William Bialek. [1] It is designed for finding the best tradeoff between accuracy and complexity (compression) when summarizing (e.g. clustering) a random variable X, given a joint probability distribution p(X,Y) between X and an observed relevant variable Y - and self ...
The concept of natural selection originally developed in the absence of a valid theory of heredity; at the time of Darwin's writing, science had yet to develop modern theories of genetics. The union of traditional Darwinian evolution with subsequent discoveries in classical genetics formed the modern synthesis of the mid-20th century .
Other causes for opposition emerge from the feasibility of substantially impacting human population. According to some researchers, even rapid global adoption of a one-child policy would result in a world population exceeding 8 billion in 2050, and in a scenario involving catastrophic mass death of 2 billion people, world population would ...
[76] [77] [78] Unlike the non-African populations, there is no consensus as to the cause of the African bottleneck. Proposed causes include climatic deterioration (from MIS 5, Toba eruption, GS20 and/or MIS 4), [49] [83] [87] reduction in substructure across African populations, and founder effects from the dispersal within Africa. [83]
In the end, the lively conversation—which carried on long after plates were cleared—boiled down to bottlenecks: regulatory bottlenecks as policymakers react, organizational bottlenecks as ...
Another possible cause of genetic divergence is the bottleneck effect. The bottleneck effect is when an event, such as a natural disaster, causes a large portion of the population to die. By chance, certain genetic patterns will be overrepresented in the remaining population, which is similar to what happens with the founder effect. [4]