Biology – Quantitative Biology – Populations and Evolution
Scientific paper
2011-04-29
Genetics 189, no. 3 1029-1043 (2011)
Biology
Quantitative Biology
Populations and Evolution
Scientific paper
We consider an asexual population under strong selection-weak mutation conditions evolving on rugged fitness landscapes with many local fitness peaks. Unlike the previous studies in which the initial fitness of the population is assumed to be high, here we start the adaptation process with a low fitness corresponding to a population in a stressful novel environment. For generic fitness distributions, using an analytic argument we find that the average number of steps to a local optimum varies logarithmically with the genotype sequence length and increases as the correlations amongst genotypic fitnesses increase. When the fitnesses are exponentially or uniformly distributed, using an evolution equation for the distribution of population fitness, we analytically calculate the fitness distribution of fixed beneficial mutations and the walk length distribution.
Jain Kavita
Seetharaman Sarada
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