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Topic: Frequency dependent selection

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	Frequency Dependent Selection [MT Dorak]
		As rare alleles increase in frequency the whole process is repeated leading to a stable polymorphism of host and parasite genotypes, with newly arising host alleles often being favored because pathogens have not had tome to adapt to these new variants.
		The mating success of each type depends on the frequency of the type relative to the frequency of the other type (if they are all callers or all satellites the mating success will be very low for all of them).
		Another form of selection, overdominance or heterozygous advantage where heterozygous genotype is selected over either of the homozygous genotypes, also has a (negative) frequency dependent component because rare alleles are disproportionately found in heterozygous genotypes, whereas common alleles are disproportionately found in homozygous genotypes.
	dorakmt.tripod.com /evolution/fselect.html (618 words)

	biology - Selection (Site not responding. Last check: )
		Selection occurs only when the individuals of a population are diverse in their characteristics--or more specifically when the traits of individuals differ with respect to how well they equip them to survive or exploit a particular pressure.
		Directional selection occurs when characteristic lie along a phenotypic spectrum and the individuals at one end are more successful, and balancing selection is a form of selection in which multiple characteristics may be favored.
		A mechanisms of selection should be distinguished from their phenotypic effect, for example, disruptive selection often is the result of disassortative sexual selection and balancing selection may result from frequency-dependent selection and overdominance.
	www.biologydaily.com /biology/Selection (545 words)

	Frequency-dependent selection - EvoWiki
		Frequency-dependent selection occurs when the fitness of a type depends upon its frequency and/or the frequencies of other types in the population.
		Depending on the social structure of a population, the sex ratio may be far from 1:1 (see, e.g., http://stevefrank.org/reprints-pdf/95AmNat-SR.pdf, which discusses sex ratios in bees).
		Frequency-dependent selection is often mentioned in the same breath as density-dependent selection.
	wiki.cotch.net /index.php/Frequency-dependent_selection (173 words)

	Frequency-dependent selection - EvoWiki (Site not responding. Last check: )
		Frequency-dependent selection occurs when the fitness of a type depends upon its frequency and/or the frequencies of other types in the population.
		Depending on the social structure of a population, the sex ratio may be far from 1:1 (see, e.g., http://stevefrank.org/reprints-pdf/95AmNat-SR.pdf, which discusses sex ratios in bees).
		Frequency-dependent selection is often mentioned in the same breath as density-dependent selection.
	www.evowiki.org /index.php/Frequency-dependent_selection (173 words)

	Frequency dependent selection (Site not responding. Last check: )
		dependent selection juror selection great selection natural selection gender selection software selection personnel selection selection rings dungeon weaving electronic selection transformer model selection karts huge selection frequency
		Frequency Selection Database Resource for USA frequency coordination and spectrum research.
		EDA Signal Integrity Software for High-Speed Frequency Dependent Losses EDA software for design engineers with high speed analog signal integrity simulation requirements involved in PCB, Cable, Connector, VLSI, and related interconnect media designs.
	www.serebella.com /encyclopedia/article-Frequency_dependent_selection.html (410 words)

	Willtek - Glossary
		The spectrum analyzer input signal is converted and selected into fixed frequencies, known as the intermediate frequencies, by heterodyning (mixing) with the aid of a tunable oscillator signal (local oscillator).
		In fundamental mixers, the fundamental of the LO frequency is used; in harmonic mixers, the LO harmonics are used for mixing.
		Since the reference frequency and the output frequency are directly related, the stability of the analyzer is directly attributable to the stability of the timebase.
	www.willtek.com /english/glossary (5190 words)

	[No title]
		The terms feature extraction and feature selection are used in the context of predictive data mining, when the goal is to find a good predictive model for some phenomenon of interest based on a large number of predictors.
		While feature selection methods will attempt to identify the best predictors among the (sometimes thousands of) available predictors, feature extraction techniques attempt to aggregate or combine the predictors in some way to extract the common information contained in them that is most useful for building the model.
		In generalized linear models, the transformed dependent variable values are predicted from (is linked to) a linear combination of predictor variables; the transformation is referred to as the link function; also, different distributions can be assumed for the dependent variable values.
	www.statsoft.com /textbook/glosf.html (3048 words)

	EPB :: Competition and frequency-dependent selection
		The role of competition and frequency-dependent selection in population differentiation and the maintenance of genetic polymorphisms
		In collaboration with Barry Sinervo we are investigating the evolutionary quantitative genetics of fitness-related traits in a free-living population of side-blotched lizards (Uta stansburiana) in California.
		This population is polymorphic with respect to throat colour, and strong correlational selection for different optimal character combinations leads to striking differences between morphs in morphology, physiology, life-history traits and behaviour.
	www.biol.lu.se /zooekologi/epb/currproj/es-proj-en.htm (593 words)

	Evolution - A-Z - Frequency-dependent selection
		It is possible for the fitness of a genotype to increase (positively frequency-dependent) or decrease (negatively frequency-dependent) as the genotype frequency in the population increases.
		When a genotype is rare, it is relatively favored by selection and it will increase in frequency; as it becomes more common, its fitness decreases and there may come a point at which it is no longer favored.
		At that point, the fitnesses of the different genotypes are equal and natural selection will not alter their frequencies: they are at equilibrium.
	www.blackwellpublishing.com /ridley/a-z/Frequency-dependent_selection.asp (326 words)

	Animal Ecology Projects
		The aim is to identify density independent and density dependent factors influencing animal numbers and population fluctuations, as well as the extent to which population responses are direct or delayed.
		This level of energy expenditure depends on the difference between the rate of energy acquisition from the environment and by the cost of running the basal activities of the body (BMR).
		Selection pressure from parasites may also vary spatially between different host species and populations or temporally between different years and seasons.
	www1.ekol.lu.se /prog_rep/prog01-02/animalecol1.html (5117 words)

	Simulation／Library-TAIYO YUDEN Co.,Ltd.-
		This is a data with frequency function included in each component of equivalent circuit data.
		This software was developed as a supporting tool for an appropriate item selection in a short time when considering our Multilayer Ferrite Chip Beads BK series.
		This software is made as a supporting tool for an appropriate item selection in a short time when considering our Rectangular Ferrite Chip Beads (High Current) FB series MJ or MH type, or Wound Chip Inductors LB series.
	www.yuden.co.jp /ut/product/sim (230 words)

	Latest News. CPU Rightmark
		Modified Intel Core2 CPU temperature indications (assumed 100 or 85 deg.C Tj(max), depending on CPU model).
		Fixed minor CPU Frequency indicator "1000 MHz" bug.
		This release fixes memory frequency determination issue on AMD K8 platforms.
	cpu.rightmark.org (3818 words)

	The CHESSON Lab (Site not responding. Last check: )
		The main objective of my research is the mechanistic understanding of this role in both ecological and evolutionary context.
		In particular I am interested in life history evolution with frequency dependent selection in temporally fluctuating and spatially heterogeneous environments.
		I am also interested in how environmental variation affects food-web interactions, and generally interacts with other forms of density dependence.
	eebweb.arizona.edu /Faculty/chesson (3141 words)

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