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4.1 Evolution and natural selection
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What evolution means

What evolution means

Flowchart of natural selection in beetles showing variation, selection pressure, survival, reproduction, and a population becoming mostly dark over generations Evolution is the gradual change in the inherited characteristics of a population over many generations. Darwin and Wallace explained that the main mechanism is natural selection.

4.1 Evolution and natural selection Lesson

  1. GCSE
  2. /Biology
  3. /4.1 Evolution and natural selection

Step-by-step lessons covering Edexcel GCSE Biology 4.1 Evolution and natural selection for Foundation and Higher tier. Each lesson breaks down 4.1.1 Work of Darwin and Wallace and 4.1.2 Resistant organisms and evolution, then works through exam-style questions in Paper 1 and Paper 2 format. Start with the foundational topics and build up to the higher-tier material.