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Variation and selection

Variation and selection

Individuals in a population have different alleles, and these differences can produce different phenotypes. Mutations are the original source of new alleles, but mutations do not occur because an organism needs a particular characteristic.

5.2.3 How evolution occurs through natural selection Lesson

  1. GCSE
  2. /Biology
  3. /5.2.3 How evolution occurs through natural selection

Step-by-step lessons on OCR GCSE Biology 5.2.3 How evolution occurs through natural selection. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons