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Transitions in individuality
1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson 85721, USA. michod@ccit.arizona.edu
Proceedings. Biological Sciences
|June 22, 1997
Summary
The evolution of multicellular organisms involves increasing cooperation and regulating conflict between cells. Genetic frameworks explain how adaptations reduce conflict, leading to greater individuality and harmony in organisms.
Area of Science:
- Evolutionary Biology
- Genetics
- Theoretical Biology
Background:
- The transition from unicellular to multicellular life is a fundamental evolutionary event.
- Understanding the mechanisms driving this integration remains a significant challenge in evolutionary theory.
Purpose of the Study:
- To present a genetic framework for the evolution of multicellularity.
- To explain this transition through the lens of cellular cooperation and conflict regulation.
Main Methods:
- Development of an explicit two-locus genetic model.
- Analysis of how genetic factors influence cooperation and conflict among cells.
Main Results:
- The framework demonstrates how organismal functions evolve to ensure cellular cooperation.
- Heritability of fitness and individuality arise from adaptations that restrict internal conflict.
Conclusions:
- Evolutionary adaptations that reduce conflict enhance individuality and harmony in multicellular organisms.
- A genetic approach provides insights into the integration of cells into higher-level individuals.