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Structured habitats and the evolution of anticompetitor toxins in bacteria.
It is suggested that structured habitats are more favorable for the evolution of colicinogenic bacteria than liquid cultures, which exist as randomly distributed individuals and as single-clone colonies.
Resource-Limited Growth, Competition, and Predation: A Model and Experimental Studies with Bacteria and Bacteriophage
We present a model of resource-limited population growth, competition, and predation based on what we believe to be biologically realistic assumptions about the relationship between resources and the…
Fitness of RNA virus decreased by Muller's ratchet
- L. Chao
- 29 November 1990
Results show that deleterious mutations are generated at a sufficiently high rate to advance Muller's ratchet in an RNA virus and that beneficial, backward and compensatory mutations cannot stop theRatchet in the observed range of fitness decrease.
PERSPECTIVE:SIGN EPISTASIS AND GENETIC CONSTRAINT ON EVOLUTIONARY TRAJECTORIES
The theoretical and empirical considerations imply that strong genetic constraint on the selective accessibility of trajectories to high fitness genotypes may exist and suggest specific areas of investigation for future research.
PERSPECTIVE:EVOLUTION AND DETECTION OF GENETIC ROBUSTNESS
- J. D. de Visser, J. Hermisson, M. Whitlock
- BiologyEvolution; international journal of organic…
- 1 September 2003
This work focuses on the first kind of robustness—genetic robustness)—and survey three growing avenues of research: measuring genetic robustness in nature and in the laboratory; understanding the evolution of genetic robusts; and exploring the implications of genetic resilientness for future evolution.
Prisoner's dilemma in an RNA virus
It is shown that the fitness of the high-multiplicity phage relative to their ancestors generates a pay-off matrix conforming to the prisoner's dilemma strategy of game theory, in which defection (selfishness) evolves, despite the greater fitness pay-offs that would result if all players were to cooperate.
Evolution by small steps and rugged landscapes in the RNA virus phi6.
A new experimental test of Fisher's geometric model of adaptive evolution subjected the bacteriophage phi6 to intensified genetic drift in small populations and caused viral fitness to decline through the accumulation of a deleterious mutation, which confirmed Fisher's main prediction that advantageous mutations of small effect should be more common.
GENETIC MOSAICISM IN PLANTS AND CLONAL ANIMALS
The genetic mosaicism hypothesis (GMH) proposed that arborescent plants accumulate spontaneous mutations and become genetically mosaic as they grow, which can contribute more to standing genetic variation in populations than do gametic mutations and thereby can increase plant evolutionary rates.
A Complex Community in a Simple Habitat: An Experimental Study with Bacteria and Phage
The fit of these observations to some previously developed theory of resource—limited growth, competition and predation is discussed and a mechanism to account for the persistence of these communities is presented.
Epistasis and Its Relationship to Canalization in the RNA Virus φ6
Evidence that positive epistasis is characteristic of deleterious mutations in the RNA bacteriophage φ6 is provided and the results suggest that even random mutations impact the degree of canalization, the buffering of a phenotype against genetic and environmental perturbations.