IGCSE Biology Variation 181

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🎓 IGCSE Biology - The Complete Course - https://www.tes.com/teaching-resource... • 🎓 IGCSE Chemistry - / igbiocomplete • ☕️ Buy me a coffee - https://www.buymeacoffee.com/ArthurJo... • Cambridge IGCSE Biology (0610/0970) • Chapter 18 - Variation and selection • Topic 18.1 - Variation • For exams in 2023, 2024 2025 (core and extended) • As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam! • My other channels: • @igpecomplete - Cambridge IGCSE PE • @ocrpecomplete - OCR GCSE PE • Timestamps: • 0:00 Contents • 0:38 Variation • 1:16 Continuous and discontinuous variation • 2:15 Investigating variation • 3:34 Mutation • 4:08 Gene mutation (extended) • 4:26 Sources of variation (extended) • Core content: • Describe variation as differences between individuals of the same species. • State that continuous variation results in a range of phenotypes between two extremes; examples include body length and body mass. • State that discontinuous variation results in a limited number of phenotypes with no intermediates; examples include ABO blood groups, seed shape in peas and seed colour in peas. • State that discontinuous variation is usually caused by genes only and continuous variation is caused by both genes and the environment. • Investigate and describe examples of continuous and discontinuous variation. • Describe mutation as genetic change. • State that mutation is the way in which new alleles are formed. • State that ionising radiation and some chemicals increase the rate of mutation. • Extended content: • Describe gene mutation as a random change in the base sequence of DNA. • State that mutation, meiosis, random mating and random fertilisation are sources of genetic variation in populations.

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