contestada

PLEASE HELP
Read the passage and answer the following question.

Antibiotics are drugs used to treat bacterial infections. This class of drug was first developed in the 1920s. At that time, infectious diseases were the leading cause of death worldwide. Within two decades of the introduction of antibiotics, almost every major bacterial disease could be effectively cured with an antibiotic. In the late 1960s, Surgeon General William Stewart reported to Congress that infectious diseases would soon be a thing of the past. Little did he know that the process of natural selection would soon prove his words false.

As antibiotics were dispensed for practically every ailment, some bacteria developed mutations that allowed them to become resistant to specific antibiotics. Through natural selection, these bacteria rapidly multiplied and spread, effectively neutralizing the effectiveness of one antibiotic after another. Today, strains of bacteria that cause tuberculosis, staph infections, and other infectious diseases are almost completely untreatable with antibiotics. Experts predict that the problem will continue to grow and can only be held in check by the discovery of new drugs.

Using evidence from this passage explain how bacteria provided an example of natural selection.

Respuesta :

The bacteria which had mutation became resistant to the antibiotic and survived and keeps on increasing, promoting natural selection.

Explanation:

The bacteria rapidly divide, the chances of mutation in the gene increases manifold.

The strains of bacteria causing tuberculosis and staph infection got mutated at DNA level such that they became resistant to antibiotics when tested those susceptible did not survive. These mutations were not harmful to bacteria and the resultant bacteria survived.

These bacteria which survived and proliferated as the environment was in their favour.

Thus, Darwin's Theory of Natural Selection is acceptable here as it says if a mutation is occurring towards the increase in population, they will be selected ones.

Otras preguntas