Appearance of antibiotic-resistant bacteria is an example of:
a. adaptive radiation
b. transduction
c. pre-existing variation in the population
d. divergent evolution
NCERT Class XII
Biology - Main Course Book
Chapter 7. Evolution
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The answer is : (a)............
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Pre-existing variation in population has an example in appearance of antibiotic-resistant bacteria.
Explanation:
When an antibiotic enters in bacterial population then the population tendency is to die in contact in that antibiotic. But some of the bacteria after mutations became antibiotic resistant. As soon as the resistant genes spread the whole population becomes antibiotic resistant. The appearance is not due to the adaptive radiation as because it is not spreading from the ancestral genes.
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