Fitness in Biological Definition

Common descent

... be some characterized by a certain relation of fitness which are able to subsist, it is not to be wondered at that this fitness is present in all the species that are currently ... infinitely greater number, there was neither fitness nor order: all of these latter have perished. ...

Fitness landscape

... In evolutionary biology , fitness landscapes or adaptive landscapes are used to ... defined replication rate (often referred to as fitness ). The set of all possible genotypes and their related fitness values is then called ...

Biology

... a population of organisms is sometimes depicted as if travelling on a fitness landscape . The arrows indicate the preferred flow of a population on the ... optima. The red ball indicates a population that moves from a very low fitness value to the top of a peak Main articles: Evolutionary biology , ...

Isozyme

... will be non-functional - in which case it will probably result in low fitness and be removed from the population by natural selection . ... chemical reaction , in which case the mutation may cause an increase in fitness , and be favoured by natural selection . An example of an isozyme ...

Natural selection

... selection have been proposed to suggest that economic or social fitness factors assessed by other humans or their built environments are somehow ... disruptive selection ecological selection evolution fitness genetic drift negative selection selection sexual ...

Evolution

... medicine endosymbiont evolutionary algorithm evolution of sex evolutionary tree experimental evolution fitness landscape genetic algorithm gradualism modern evolutionary synthesis natural science neutral theory of molecular evolution ...

Extinction

... and is the most dramatic example of a population bottleneck. Habitat degradation The degradation of a species' habitat may alter the fitness landscape to such an extent that the species is no longer able to survive and becomes extinct. This may occur by direct effects, such as the ...

Gene pool

... that can survive bouts of intense selection . Meanwhile, low genetic diversity (see inbreeding and population bottlenecks ) can cause reduced fitness and an increased chance of extinction . When many alleles exist for a given gene or locus , a population is said to be polymorphic with ...

Molecular evolution

... in this case, less fit), this means that population will always harbor a number of less fit individuals, which leads to a decrease in the average fitness of the population. This is sometimes referred to as genetic load , in this case it is a special kind of load known as segregational load . Crow ...

Mutational meltdown

... Mutational meltdown refers to the process by which a small population accumulates deleterious mutations, which leads to loss of fitness and decline of the population size, which leads to further accumulation of deleterious mutations. A population experiencing mutational meltdown is ...

Muscle

... assure a smooth projection. Role in health and disease Exercise Exercise is often recommended as a means of improving motor skills , fitness and muscle strength. Exercise has several effects upon muscles, connective tissue and bone , and the nerves that stimulate the muscles. ...

Neutral theory of molecular evolution

... existing species, the vast majority of single- nucleotide differences are selectively "neutral." That is, these differences do not influence the fitness of either the species or the individuals who make up the species. As a result, the theory regards these genome features as neither subject to, nor ...

Population genetics

... is Stanford -based population geneticist particularly interested in human population genetics. See also Ecological genetics fitness landscape Founder effect Genotype-phenotype distinction Hardy-Weinberg principle Microevolution Molecular evolution ...

Sewall Wright

... the "Sewall Wright effect") and developed the inbreeding coefficient and many of its applications. Wright was the developer of adaptive surfaces ( fitness landscapes ), and he emphasized the importance of the interaction of genetic drift and natural selection in determining the outcome of evolution . ...

Species

... this does not demonstrate that they would freely interbreed in the wild, nor does it always provide much information about the evolutionary fitness of hybrid individuals. A certain amount can be inferred from other experimental methods: for example, do the members of population A respond ...