IGCSE Biology - 3b Inheritance - Variation and Mutation

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New Edexcel IGCSE 9-1 4BI1 syllabus for 2017 first examined in 2019


Section 3b Inheritance - Variation and Mutation


  • 3.33 understand that variation within a species can be genetic, environmental, or a combination of both
  • 3.34 understand that mutation is a rare, random change in genetic material that can be inherited
  • 3.35B understand how a change in DNA can affect the phenotype by altering the sequence of amino acids in a protein
  • 3.36B understand how most genetic mutations have no effect on the phenotype, some have a small effect and rarely do they have a significant effect
  • 3.37B understand that the incidence of mutations can be increased by exposure to ionising radiation (for example, gamma rays, x-rays and ultraviolet rays) and some chemical mutagens (for example, chemicals in tobacco)


New and updated resource for IGCSE 9-1- More practical pages, updated design, concept checker and exam style question for each topic.