question_answer 1)

Explain antibiotic resistance observed in bacteria in light of Darwinian Natural selection theory. 

Answer:

When a bacterial population encounters a particular antibiotic, those sensitive to it die. Sometimes a bacterial population happens to contain new or a few bacteria having mutations which make them resistant to the antibiotic. Such resistant bacteria survive and multiply quickly as the genes become widespread and entire bacterial population becomes resistant. This type of sorting out of the organisms with useful variations has been called natural selection by Darwin.