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Directional selection - Wikipedia, the free encyclopedia
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In population genetics, directional selection occurs when natural selection favors a single phenotype and therefore allele frequency continuously shifts in one direction. Under directional selection...
en.wikipedia.org/wiki/Directional_selection
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We consider the effects of epistasis in a polygenic trait in the balance of mutation and stabilizing selection. ... We consider the effects of epistasis in a polygenic trait in the balance of mutation and stabilizing selection. The main issues are the genetic variation maintained in equilibrium and the evolution of...
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www.medscape.com/medline/abstract/12858280
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The chemical composition of the sexual communication signals of female moths is thought to be under strong stabilizing selection, because females that produce atypical pheromone blends suffer lower success in finding mates. ... The Medscape Journal ... Allergy & Clinical Immunology...
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www.medscape.com/medline/abstract/16585529
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Stabilizing selection favors the norm, the common, average traits in a population. Look at the Siberian Husky, a dog bred for working in the snow. The Siberian Husky is a medium dog, males weighing 16-27kg (35-60lbs). These dogs have strong pectoral and leg muscles, allowing it to move through dense snow.
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www.starsandseas.com/SAS%20Evolution/SAS%20natselection...
www.starsandseas.com/SAS%20Evolution/SAS%20natselection/natselec_stabilizing.htm
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perhaps sexual selection or liability to predation is at work. In any case, stabilizing selection is common. In humans, for example, the incidence of infant mortality is higher for very heavy as well as for very light babies.
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users.rcn.com/jkimball.ma.ultranet/BiologyPages/E/Evolu...
users.rcn.com/jkimball.ma.ultranet/BiologyPages/E/Evolution.html
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When selective pressures select against the two extremes of a trait, the population experiences stabilizing selection. For example, plant height might be acted on by stabilizing selection. A plant that is too short may not be able to compete with other plants for sunlight.
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www.sparknotes.com/biology/evolution/naturalselection/s...
www.sparknotes.com/biology/evolution/naturalselection/section1.html
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Figure: stabilizing selection on human birth weight. Infants weighing 8 lb at birth have a higher survival rate than heavier or lighter infants. The graph is based on infants born in London from 1935 to 1946. From Karn and Penrose (1951).
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www.blackwellpublishing.com/ridley/a-z/Stabilizing_sele...
www.blackwellpublishing.com/ridley/a-z/Stabilizing_selection.asp
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Stabilizing Selection occurs when selection favors the intermediate trait value over the extreme values. Populations under this type of selection typically experience a decrease in the amount of additive genetic variation for the trait under selection...
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www.evotutor.org/Selection/Sl5A.html
www.evotutor.org/Selection/Sl5A.html
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