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Shifting balance theory aims to explain how this may be possible. The shifting balance theory is a theory of evolution proposed in 1932 by Sewall Wright, suggesting that adaptive evolution may proceed most quickly when a population divides into subpopulations with restricted gene flow.
Sewall Green Wright ForMemRS [3] HonFRSE (December 21, 1889 – March 3, 1988) was an American geneticist known for his influential work on evolutionary theory and also for his work on path analysis. He was a founder of population genetics alongside Ronald Fisher and J. B. S. Haldane , which was a major step in the development of the modern ...
In his 1932 paper, Wright presents the concept of an evolutionary landscape composed of a polydimensional array of gene or genotype frequencies and an axis of fitness, which served as a visual metaphor to explain his shifting balance theory. Similarly to Janet, Wright felt the landscape could be reduced to two dimensions for simplicity.
Evolution 101—Shifting Balance Theory (Figure at bottom of page) Superimposing evolutionary trajectories onto fitness landscapes in virtual reality; Further reading.
Neutral theory – Theory of evolution by changes at the molecular level; Shifting balance theory – One version of the theory of evolution; Price equation – Description of how a trait or gene changes in frequency over time; Coefficient of relationship – Measure of biological relationship between individuals
Sewall Wright was the first to attach this significance to random drift and small, newly isolated populations with his shifting balance theory of speciation. [46] Following after Wright, Ernst Mayr created many persuasive models to show that the decline in genetic variation and small population size following the founder effect were critically ...
Sewall Wright was the first to attach this significance to random drift and small, newly isolated populations with his shifting balance theory of speciation. [16] Following behind Wright, Ernst Mayr created many persuasive models to show that the decline in genetic variation and small population size accompanying the founder effect were ...
This theory implies that purifying selection is more efficient in the haploid stage of the life cycle where fitness effects are more fully expressed than in the diploid stage of the life cycle. Evidence supporting the masking theory has been reported in the single-celled yeast Saccharomyces cerevisiae . [ 8 ]