Question

After the use of DDT insecticide, what was the outcome in the mosquito population?

Options

• All mosquitoes survived and reproduced equally

• Mosquitoes developed dark (melanic) colouration

• Only susceptible mosquitoes survived and reproduced

• Only resistant mosquitoes survived and reproduced

Answer 1

The use of DDT insecticide acted as the selective pressure, and the outcome was that only resistant mosquitoes survived and reproduced. This demonstrates a selection of resistant genotypes within the population.