A. Bed bug populations are considered resistant to dinotefuran if their mean lethal concentration
(LC50) is significantly higher than the LC50 of the control population. (i) Based on the results
presented in Table 2, have the Michigan and Jersey City populations developed a
resistance to dinotefuran? Explain and justify your answer using your knowledge of statistics.
2. Natural Selection in Bed Bugs Similar to bacteria developing resistance to antibiotics, bed bugs can quickly acquire resistanceto certain types of insecticide treatments. In order to investigate the resistance of bed bugs towidely used insecticides, researchers administered increasing doses of the insecticide dinotefiiranto three different bed bug populations to determine the lethal concentration of dtnoteﬁiran foreach group. Bed bugs from two of the populations (Michigan and Jersey City) had been collectedfrom areas with repeated dinoteﬁiran treatment. The Fort Dix population was never exposed todinoteﬁoan and was designated as the control group. Experimental results and demographicdetails for each group are shown in Table 2 below. Mean lethal Time in laboratoryOrigin of bed Number of Ir t’ since last exposure Stande deviationbug population individuals come” 3 1°“ ‘ to dinotqfnran of LC50 (ng/ml)LCSO (ngtml) earsMichigan 50 3,872 0.25 1,176Jersey City 60 679 1.0 219Fort Dix(control) 60 14 NIA 5 Table 2. Dinoteﬁtran toxic concentration for each bed bug group, reported as the L050concentration (1′. e. concentration of the insecticide that kills 50% of the tested bugs after 72hours ofcontactj’. Data adapted ﬁom Romero and Anderson (2016).