We present a model for biological aging that considers the number of individuals whose (inherited) genotype determines the maximum age for death: each individual may die before that age due to some external factor, but never after that limit. The genotype of the offspring is inherited from the parent with some mutations, described by a transition matrix. The model can describe different strategies of reproduction and it is exactly soluble. The applied our method to the bit-string model for aging and the results are in perfect agreement with numerical simulations. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 19]
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