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Collective adaptation in a statistical model of an evolving population
1Institut Curie, Section de Physique et Chimie, Laboratoire Curie, Paris, France.
Summary
Asexual and sexual reproduction in model populations show different responses to unfit genotypes. Sexual reproduction exhibits a critical transition to an adaptive state, enhancing collective population fitness.
Area of Science:
- Evolutionary biology
- Population genetics
- Theoretical biology
Background:
- Populations evolve in fitness landscapes with random distributions of fit and unfit genotypes.
- Reproductive mechanisms significantly influence evolutionary trajectories.
Purpose of the Study:
- To investigate the impact of varying fractions of unfit genotypes on asexual and sexual reproduction.
- To identify differences in evolutionary dynamics between the two reproductive strategies.
Main Methods:
- Simulating model populations with asexual and sexual reproduction.
- Introducing a variable fraction (chi) of unfit genotypes.
- Analyzing effective mutation rate (lambda) and sterile individual fraction (delta).
Main Results:
- Asexual populations show a proportional decrease in effective mutation rate with increasing unfit genotypes.
- Sexual populations maintain a constant effective mutation rate for small fractions of unfit genotypes.
- Sexual populations exhibit a critical transition (chi*) to an adaptive regime with enhanced average fitness.
Conclusions:
- Sexual reproduction demonstrates a distinct adaptive transition not observed in asexual reproduction.
- This transition in sexual populations is linked to an improvement in collective fitness.
- The fraction of unfit genotypes plays a crucial role in determining population evolutionary fate.