Figure 1
From: A model of evolution with constant selective pressure for regulatory DNA sites
Transitional probabilities P cn , P cc , P nn , P nc , P nm for λ = 1/6, μ= 1/2. This figure describes the case P cc (u) > P nn (u) for all u > 0. The consensus is strong, since π c = 2/3. Since the rate of transition between non-consensus states μ is greater than the rate of transition from the consensus state λ, we have P cn (u) <P nm (u). The relation between the probability of conservation of a non-consensus nucleotide and the probability of transition from the non-consensus state to the consensus one is shown, P nn (u) > P nc (u) for u ∈ (0, u0) and, vice versa, P nn (u) <P nc (u) for u > u0. This figure exemplifies all simple cases that hold for any λ ∈ (0, 1), μ > 0, u > 0 (see the corresponding paragraph in the main text).