Positive mutations and mutation-dependent Verhulst factor in Penna ageing model

Details Positive mutations and mutation-dependent Verhulst factor in Penna ageing model Positive mutations and mutation-dependent Verhulst factor in Penna ageing model

2003-08-26

arxiv.org/abs/cond-mat/0308532v1

Physics

Condensed Matter

Statistical Mechanics

9 pages, including 3 figures, to be submitted to Physica A

Scientific paper

We twice modify the Penna model for biological ageing. First we introduce back (good) mutations and a memory for them into the model. It allows us to observe an improvement of the species fitness over long time scales as well as punctuated equilibrium. Second we adopt a food/space competition factor that depends on the number of accumulated mutations in the individuals genomes, and get rid of the fixed limiting number of allowed mutations. Besides reproducing the main results of the standard model, we also observe a mortality maximum for the oldest old.

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