The overuse of antibiotics has led to a form of antibiotic resistant tuberculosis. This has occurred as a result of:
A) directional selection within the bacterial population.
B) stabilizing selection within the bacterial population.
C) disruptive selection within the bacterial population.
D) balanced polymorphism within the bacterial population.
E) a heterozygote advantage within the bacterial population.

Question

Quizplus · Accepted Answer

Directional selection occurs when an environmental pressure, such as the use of antibiotics, favors one extreme phenotype over others in the population. In this case, bacteria that are resistant to antibiotics are more likely to survive and reproduce, leading to an increase in antibiotic-resistant tuberculosis.

The Overuse of Antibiotics Has Led to a Form of Antibiotic