The pattern of survival at 23°C and 28°C and the evaluation of heat sensitivity. A solid line represents the change of survival between 23°C and 28°C for the control (+/+) and a broken line represents the change of survival between 23°C and 28°C for the deficiency heterozygote (Df/+). (a) Equivalent heat sensitivity between the control and deficiency heterozygote is shown. (b) A more heat sensitive deficiency heterozygote compared to the control is shown. (c) A more heat resistant deficiency heterozygote than the control is shown.