Contrasted patterns of selective pressure in three recent paralogous gene pairs in the Medicagogenus (L.)

Table 2 Site models results: estimated parameters and log-likelihood ratio tests

Note. Models are M_8A, ω following a β distribution discretized into 10 categories of similar frequency (0 < ω_1–10 < 1) plus an additional category of ω_ad = 1, accounting for neutral sites; M₈ differs from M_8A only by the additional category of ω which is constraint to be superior to 1 (ω_ad > 1), to account for sites under positive selection.
Parameters are frequencies and values of ω for M_8A and M₈, p and q are the parameters in β distribution; for M_8A and M₈ p_ad and ω_ad are the frequencies and values of additional class of ω; NB ω_ad is fixed equal to one in M_8A. np: number of free parameters; logL: log-likelihood; LRT: likelihood ratio test statistic between indicated models; one (respectively two) asterisk indicates that the probability of observing such an LRT or higher under the compared model is <0.05 (respectively <0.01), assuming that the LRT follows a χ² distribution with the difference of free parameters between the compared models as the number of degrees of freedom.

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