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Explain the emergence of antibiotic-resistant bacterial strains as a case study of natural selection

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Cambridge IGCSE BiologyVariation and selectionSupplement content

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Explain the emergence of antibiotic-resistant bacterial strains as a case study of natural selection

  • This point belongs to Selection, especially Selection outcomes.
  • You need to be able to explain the emergence of antibiotic-resistant bacterial strains as a case study of natural selection.
  • The key ideas to know are Describe.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Describe

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Description

Antibiotic Resistance

When antibiotics are used, most bacteria are killed, but some bacteria with mutations that confer resistance survive and reproduce. Over time, the population of bacteria becomes dominated by resistant strains.

  1. a

    Describe how antibiotic-resistant bacterial strains emerge as a result of natural selection.

    Aim for approximately 2 distinct marking points.

    [2]
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Cambridge IGCSEBiology resources