Question

The mechanism by which bacteria became resistant to the introduction of new antibiotic in less than 2 years is known as
I. Divergent evolution
II. Adaptive radiation
III. Directional selection

• A. I only
• B. II only
• C. III Only
• D. I and III only
• E. I, II and III

Answer 1

The correct option is C III Only

In the case of both divergent evolution and adaptive radiation, organisms are exposed to the multiple of new or newly formed ecological niches leading to diversification of ancestral line into different forms. Evolution of antibiotic resistance in bacteria population represents the directional natural selection that favors one of the extreme traits i.e. here, antibiotic resistance. Thus, the correct answer is C.