Describe how the malaria parasite developed drug resistance through natural selection.

Here's how the malaria parasite developed drug resistance through natural selection:

• Within a population of malaria parasites, there is natural variation due to random mutations. Some parasites may have a genetic mutation that makes them resistant to antimalarial drugs, even before drug exposure.
• When antimalarial drugs are administered, they act as a selection pressure. The drugs kill off the non-resistant parasites, which are susceptible to the treatment.
• The parasites with the drug-resistant mutation are able to survive the treatment because they are not affected by the drug.
• These surviving, drug-resistant parasites then reproduce, passing on their resistance genes to their offspring.
• Over successive generations, the proportion of drug-resistant parasites in the population increases, leading to a population that is largely resistant to the drugs.