pankajSama589 pankajSama589

17-06-2015
Biology

Answered

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

Answer :

prantika2 prantika2

17-06-2015

The answer is : (a)............

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phillipinestest phillipinestest

28-05-2019

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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