Overdispersed molecular evolution in constant environments.

Abstract excerpt

According to recent data analysis of DNA sequences, the dispersion index, defined as the variance-to-mean ratio of the number of base substitutions in a lineage, is often much larger than unity, which is in conflict with simple Poisson processes assumed in the molecular clock hypothesis. In this paper, it will be shown that the dispersion index can be much larger than unity in a model in which the fitness of DNA...

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