Table 4. Log-likelihood ratio test between models including and excluding an interaction terms between Ac/ac and Li/li genes.

Cline	Ac*Li log likelihood	Ac+Li log likelihood	Δ	X	P value (1 d.f.)
Central USA	129.23	128.64	0.58	1.16	0.281
New Zealand	48.45	43.67	4.78	9.56	0.002
Mt Baker	18.83	18.83	0.00	0.00	0.961

Statistical significance at P<0.05 is indicated by bold text.