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Stabilizing selection (not to be confused with negative or purifying selection [1] [2]) is a type of natural selection in which the population mean stabilizes on a particular non-extreme trait value. This is thought to be the most common mechanism of action for natural selection because most traits do not appear to change drastically over time. [3]
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. ... Far more common is stabilizing selection, which ...
In natural selection, negative selection [1] or purifying selection is the selective removal of alleles that are deleterious. This can result in stabilising selection through the purging of deleterious genetic polymorphisms that arise through random mutations. [2] [3]
This was translated by Theodosius Dobzhansky and appeared in English as Factors of Evolution: The Theory of Stabilizing Selection in 1949. [4] On 23 August 1948 he became victim of order 1208, one of a series signed by Minister of Higher Education in the USSR, Sergei Kaftanov , which led to the mass dismissals of many university professors ...
Middle (Graph 2) represents stabilizing selection with the moderate trait favored. Bottom (Graph 3) represents disruptive selection with both extremes being favored. In population genetics , directional selection is a type of natural selection in which one extreme phenotype is favored over both the other extreme and moderate phenotypes.
The K a /K s ratio is used to infer the direction and magnitude of natural selection acting on protein coding genes. A ratio greater than 1 implies positive or Darwinian selection (driving change); less than 1 implies purifying or stabilizing selection (acting against change); and a ratio of exactly 1 indicates neutral (i.e. no) selection.
J. communis Tortuga – A tough selection of the common juniper, it features a neat, low mound of fluffy jade green foliage. Wood is a big fan, stating “It is tolerant of deer, drought, dry soil ...
This is an example of balancing selection between the fierce selection against homozygous sickle-cell sufferers, and the selection against the standard HgbA homozygotes by malaria. The heterozygote has a permanent advantage (a higher fitness) wherever malaria exists.