In an Insect Species, Survival in Agricultural Fields Regularly Sprayed

Multiple Choice

In an insect species, survival in agricultural fields regularly sprayed with insecticide is determined by the genotype for a detoxification enzyme encoded by a gene with two alleles, A and D. Which of the following statements is consistent with the data? $$\begin{array} { | l | l | } \hline \text { Genotype } & \text { Relative Fitness } \\\hline \mathrm { AA } & 1.00 \\\hline \mathrm { AD } & 0.70 \\\hline \mathrm { OD } & 0.05 \\\hline\end{array}$$

A) Directional selection will increase the frequency of the A allele at a pace determined by the intensity of natural selection.
B) The D allele frequency will change faster as it gets less frequent.
C) Eventually, natural selection should lead to a balanced polymorphism.
D) This will likely lead to the frequency of the A allele being eliminated (f=0.0) and the D allele being fixed (f=1.0) .
E) Both the A and D alleles should reach stable equilibrium frequencies that are maintained in a steady state.