selection pressure

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se·lec·tion pres·sure

impact of effective reproduction due to environmental impact on the phenotype.

selection pressure

Any change in the environment that encourages particular mutations to succeed. For example, antibiotic use kills susceptible bacteria and allows microorganisms with resistant genes to survive and proliferate.

selection pressure

a measure of the amount of relative reproductive disadvantage of one phenotype over another of the same species living together in the same area. Such pressure is usually represented by the selection coefficients which can have a value from zero (no selective disadvantage, maximum FITNESS) to 1.0 (complete selective disadvantage leading to actual death or GENETIC DEATH, minimum fitness).
References in periodicals archive ?
Among language learners who can engage in both rote-learning and extraction of rules, evolutionary pressures will produce languages that are compositional, because reliance on a constrained number of language analytical rules is more economical than individual retention of each symbol (Hurford, 'Why Synonymy is Rare: Fitness is in the Speaker', in Banzhaf, Christaller, Dittrich, Kim & Ziegler, eds.
The expelled organism will be under evolutionary pressure to create tougher biofilms resistant to EDTA, or create another mode of attachment to the intestine.
The problem with that hypothesis is that famine probably does not exert a lot of evolutionary pressure, Dr.
The likely increased use of oral antibacterial drugs for patients with possible influenza and for prophylaxis and treatment of secondary bacterial pneumonia would enhance the existing evolutionary pressure toward resistance.
Harsh conditions exerted evolutionary pressure by killing many individuals before they reached breeding age and preventing many that did from raising enough offspring to sustain their lineages.
Chapter 4 shows that, while the evolutionary pressure embodied in a wide class of deterministic dynamics eliminates strictly dominated strategies, it does not eliminate weakly dominated strategies.
We and others speculated that there should be some very positive evolutionary pressure to keep these cells and these antibodies, because if they were just bad and deleterious, they would have been eliminated.
Under evolutionary pressure caused by the quest for cost reduction and transparency, new business models are gyrating into place, existing businesses are adapting and New Business is emerging.
In the starkest warning yet of the threat to ocean health, the International Programme on the State of the Ocean (IPSO) said that this [acidification] is unprecedented in the Earth's known history, and that we are entering an unknown territory of marine ecosystem change, and exposing organisms to intolerable evolutionary pressure.
There was not a good idea before about what aspects of faces were shaped by which evolutionary pressure.
This avoids toxic effects on the liver and does not put evolutionary pressure on the virus to mutate to a drug resistant strain.
Driven by innovation in consumer electronics technology, the automotive sector is under immense evolutionary pressure.

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