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Updated: Feb 11, 2026
12:02
Molecular Evolution of the Tre Recombinase
Published on: May 29, 2008
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Neutral Theory and Phenotypic Evolution.
1Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI.
Molecular Biology and Evolution
|April 17, 2018
Summary
Phenotypic evolution is less likely to be neutral than molecular evolution. Adaptive evolution increases with the biological organization level of phenotypic traits, suggesting a hierarchical model for evolutionary change.
Area of Science:
- Evolutionary biology
- Molecular evolution
- Developmental biology
Background:
- The neutral theory of molecular evolution explains genetic sequence changes.
- Its applicability to phenotypic evolution remains debated.
- Hierarchical organization of biological traits may influence evolutionary mechanisms.
Purpose of the Study:
- To propose and test a hypothesis regarding the neutral versus adaptive evolution of phenotypic traits.
- To investigate the relationship between the level of biological organization and the mode of phenotypic evolution.
Main Methods:
- Theoretical proposal based on the neutral theory of molecular evolution.
- Review and synthesis of existing empirical findings on molecular and organismal trait evolution.
- Hypothesizing a hierarchical model for phenotypic evolution.
Main Results:
- Molecular traits frequently exhibit neutral evolution.
- A significant proportion of organismal traits show evidence of adaptive evolution.
- The fraction of adaptive evolutionary changes in phenotype increases with the level of biological organization.
Conclusions:
- Phenotypic evolution is less likely to be neutral compared to molecular evolution.
- A hierarchical model where adaptive evolution rises with organizational level provides a framework for understanding phenotypic evolution.
- Further unbiased studies on phenotypic traits are necessary to validate this hypothesis.
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