Answer:
(c) Appearance of
antibiotic-resistant bacteria is an example of pre-existing variation in the
population, when a bacterial population encounters a particular antibiotic, those
sensitive to it die.
But some bacteria having mutations
become resistant to the antibiotic. Soon, the resistance providing genes become
widespread and the entire population becomes resistant.
It is not due to adaptive
radiation because adaptive radiation is development of different functional
structures from a common ancestral form. Which is also known as divergent evolution.
Transduction is a process
whereby, foreign DNA is introduced into another cell via a viral vector.
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