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5.2 Natural selection and evolution

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Question 3
F

Some bacteria are resistant to antibiotics.

The Figure shows the percentage of infections caused by one type of bacterium that were resistant to antibiotic X, in one country, between 2000 and 2020.

Figure

image

a.

Give the percentage of infections that were resistant to antibiotic X in 2012.

[1]
b.

Calculate how many times greater the percentage of resistant infections was in 2016 than in 2004.

[2]
c.

Explain how the population of bacteria became resistant to antibiotic X.

[3]
d.

Explain why antibiotic resistance in bacteria is used as evidence for evolution.

[2]
Markscheme

5.2 Natural selection and evolution Questions

  1. GCSE
  2. /Biology
  3. /5.2 Natural selection and evolution

122 exam-style questions on OCR GCSE Biology 5.2 Natural selection and evolution, covering 5.2.1 Genetic variation within a population, 5.2.2 Developments in classification systems, 5.2.3 How evolution occurs through natural selection, 5.2.4 Evolution as change over time, 5.2.5 Evidence for evolution, and 5.2.6 Darwin and Wallace. Each one has a worked solution and a mark scheme showing where the marks go.

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