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6.3 The development of understanding of genetics and evolution

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Question 23

A population of annual plants grows in grassland. The plants flower at different times. After a change in rainfall, the soil became too dry for the plants to survive at an earlier point in each summer.

Scientists collected the following data.

TimeMean time when the soil became too dryPlants that flowered before July (%)
Before the change in rainfalllate August18
30 generations after the change in rainfallmid-July72

Using the data, explain how natural selection could have caused the change in flowering time in this population.

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6.3 The development of understanding of genetics and evolution Questions

  1. GCSE
  2. /Biology
  3. /6.3 The development of understanding of genetics and evolution

71 exam-style questions on AQA GCSE Biology 6.3 The development of understanding of genetics and evolution, covering 6.3.1 Theory of evolution, 6.3.2 Speciation, 6.3.3 The understanding of genetics, 6.3.4 Evidence for evolution, 6.3.5 Fossils, 6.3.6 Extinction, and 6.3.7 Resistant bacteria. Each one has a worked solution and a mark scheme showing where the marks go.

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