Table 1.

Narrow-sense heritabilities (h²) of males and females and between-sex genetic correlations (r_A) for larval peak mass, pupal mass, growth rate, critical weight, the interval to cessation of growth (ICG) and 5th instar development time of the hawkmoth Manduca sexta. (Standard errors were obtained by a jackknifing routine created by the authors in SAS. Two-sample t-tests were used to compare means except where noted. See text for explanation on the calculation of genetic parameters. Note: r_A's were undefined for the critical weight and the ICG owing to zero covariances for males.)

	males		females
	h2	s.e.	h2	s.e.	t	p	rA	s.e.	ta	p
peak mass	0.48	0.07	0.73	0.09	2.17	0.03	0.72	0.17	1.62	0.11
pupal mass	0.28	0.08	0.49	0.09	1.74	0.08	0.86	0.23	0.61	0.54
growth rate	0.30	0.08	0.24	0.08	0.46	0.64	0.53	0.37	1.25	0.21
5th instar dev. time	0.33	0.07	0.15	0.07	1.76	0.08	1.14	0.48	0.29	0.77
critical weight	0	0	0.29	0.08	3.41b	0.0008	—	—	—	—
ICG	0	0	0.27	0.08	3.28b	0.0013	—	—	—	—

^aA one-sample t-test was used to test the means against the hypothesis that the mean = 1.

^bA one-sample t-test was used to test the means against the hypothesis that the mean = 0.