Cambridge IGCSE Biology (0610) - IGCSE Biology - Variation (18.1)

🎓 IGCSE Biology - The Complete Course: https://www.tes.com/teaching-resource/resource-12989155 IGCSE Chemistry - The Complete Course: 🎓 Complete Teaching Resource (including past exam questions and mark schemes organised by chapter): https://www.tes.com/teaching-resource/resource-13280954 🎓 Student resource (PDF only): https://www.tes.com/teaching-resource/resource-13245244 🎓 All the videos (the complete library on Patreon): https://www.patreon.com/igbiocomplete ☕️ Buy me a coffee - https://www.buymeacoffee.com/ArthurJohnParker Cambridge IGCSE Biology (0610/0970) Chapter 18 - Variation and selection Topic 18.1 - Variation For exams from 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.