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Nonlinear developmental processes as sources of dominance.
1Department of Biology, Duke University, Durham, North Carolina 27708, USA. mag5@duke.edu
Genetics
|September 19, 2001
Summary
Genetic variation and phenotypic variation show nonlinear relationships, leading to allele dominance in developmental processes. This study reveals dominance emerges from diffusion mechanisms, reconciling evolutionary theories.
Area of Science:
- Developmental biology
- Genetics
- Evolutionary biology
Background:
- Phenotypes arise from gene-controlled developmental processes.
- Nonlinear gene-phenotype relationships can lead to allele dominance.
Purpose of the Study:
- Explore dominance properties in a diffusion-gradient-threshold developmental mechanism.
- Investigate the emergence of dominance from nonlinear processes.
Main Methods:
- Modeling a simple developmental system with a diffusion-gradient-threshold mechanism.
- Analyzing the impact of nonlinear diffusion on allele interactions.
Main Results:
- A single nonlinear process (diffusion) causes dominance in all mechanism components.
- New mutations can be equally likely dominant or recessive, unlike in metabolic pathways.
- Dominance emerges from physiological processes and can evolve via microevolution.
Conclusions:
- Nonlinear dynamics in developmental systems are a key source of allele dominance.
- This model reconciles Fisher's and Wright's opposing views on dominance evolution.