Table 5.

Observed and expected mortality of the BC strain of P. xylostella treated with Cry2Ad, as evaluated with a Chi square test (χ²).

Concentration of Cry2Ad (ng/ml)	Observed		Expected		χ2	P
	Dead	Alive	Dead	Alive
22.93	7	29	28	44	3.30	0.0692
45.86	8	28	36	36	6.56	0.0104
91.72	12	24	43	29	5.67	0.0172
183.44	16	20	51	21	6.02	0.0141
366.88	19	17	58	14	7.74	0.0054
∑χ2					29.29

The single gene conferring Cry2Ad resistance is defined as the Chi-square hypothesis.