Cambridge IGCSE Biology
18.1Variation
Variation in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic40 practice questions2 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 18.1.1Describe variation, and distinguish continuous and discontinuous variation, their examples and their causes.
- 18.1.2Investigate and describe examples of continuous and discontinuous variation.
- 18.1.3Describe mutation as genetic change that forms new alleles, and state that ionising radiation and some chemicals increase the mutation rate.
- 18.1.4Supplement: describe gene mutation as a random change in the base sequence of DNA and state the sources of genetic variation in populations.
Lessons
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Continuous and discontinuous variation
18 min
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Mutation
19 min
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Sample question
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