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A test of the Markovian model of DNA evolution.

The Markov model of molecular evolution has recently received a significant amount of interest because its statistical nature allows for the testing of a number of evolutionary hypotheses. Here we propose a test which assesses whether data from two species sharing a common ancestor will fit a general Markovian model. We illustrate the test with two examples of data which appear at first glance not to fit a Markov model.