A student writes: 'An individual bacterium evolves when it becomes resistant to an antibiotic.' Which is the best correction of the student's statement?
A bacterium evolves when it is killed by an antibiotic.
Evolution is a change in a population, not in one individual.
Evolution only happens in organisms that reproduce sexually.
A bacterium evolves when it makes antibodies to an antibiotic.
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.