Widespread gene duplication and adaptive evolution in the RNA interference pathways of the Drosophila obscura group

Table 2 Joint estimates of adaptive evolution across genes

Model	Model description	LnL	AICc	Akaike weight (w_i)	Maximum likelihood estimate of α
Model	Model description	LnL	AICc	Akaike weight (w_i)	Ancestral	Duplicate
M0	α-anc = 0, α-dup = 0	−300.61	633.221	4 × 10⁻¹²	0
M1	α-anc > 0, α-dup > 0	−284.105	602.209	2.6 × 10^− 5	0.539
M1	α-anc = α-dup	−284.105	602.209	2.6 × 10^− 5	0.539
M2	α-anc > 0, α-dup = 0	−301.857	637.713	5.1 × 10^− 13	0.047	0
M3	α-anc = 0, α-dup > 0	− 275.249	584.498	0.186	0	0.618
M4	α-anc > 0, α-dup > 0	− 272.774	581.547	0.813	0.2	0.676
M4	α-anc ≠ α-dup	− 272.774	581.547	0.813	0.2	0.676

Maximum-likelihood extension of MK test model fitted with different constraints on α [45]. LnL is the log likelihood of the model, AIC is the Akaike Information Criterion with corresponding relative probability as Akaike Weight (wi). The most supported model is in bold

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