Fig. 2

Correlated responses of fitness traits to selection. a. Survival curves of flies from the three selection populations (n = 36–40; N: black, D: red, C: blue). The proportion of surviving flies (y axis) is plotted against the number of days (x axis). b. Number of progeny produced per female for N, C and D crosses. Grey and white bars indicate the number of males and females, respectively (average ± standard error). Development time (egg-to-adult) distributions are shown for male progeny (c) and females (d). Proportion (%) of progeny produced per female per day. Males: N (n = 3556), D (n = 2308) and C (n = 2998). Females: N (n = 3748), D (n = 2401) and C (n = 3145)