Question
Biology Question on evolution
Appearance of antibiotic-resistant bacteria is an example of
A
adaptive radiation
B
transduction
C
pre-existing variation in the population
D
divergent evolution
Answer
pre-existing variation in the population
Explanation
Solution
When a bacterial population encounters a particular antibiotic, those sensitive to it die. But some bacteria having mutations become resistant to the antibiotic. Such resistant bacteria survive and multiply quickly as the competing bacteria have died. Soon the resistance providing genes become widespread and entire bacterial population becomes resistant