Shifting balance theory

Shifting balance theory

Wright's Shifting balance theory is a theory by Sewall Wright used to model evolution using both drift and selection. Wright assumes that populations are very small, genetic drift and epistasis are very important.Shifting balance theory:1. A species divided into subpopulations small enoughthat random genetic drift important2. Drift in one subpopulation carries it past anadaptive valley to a new higher adaptive peak3. This subpopulation has increased fitness. It makesmore offspring, which spread the new adaptation toother populations through increased gene flow


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