GCSE Biology (9-1) - GCSE Biology - Variation and Evolution (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. Variation Within Populations * Genetic Variation (differences in genes/genomes) * Environmental Variation (influence of surroundings) * Phenotype (observable characteristics from genes and environment interaction) 2. Mutations as a Source of Variation * Definition of mutation (change in DNA) * Effects of mutations on phenotype (neutral, harmful, beneficial) 3. Natural Selection * Survival of the fittest (individuals with beneficial adaptations survive and reproduce) * Passing on advantageous traits/genes 4. Evolution * Darwin's theory * How natural selection over time leads to changes in species characteristics * Speciation (formation of new species) * Evidence for evolution (brief mention of antibiotic resistance and fossils) *** CHAPTERS *** 0:00 Introduction 0:26 Variation & Phenotype 0:47 Influence of Genes on Phenotype 1:17 Influence of Environment on Phenotype 2:05 Source of Genetic Variation: Mutations 2:53 Natural Selection & Survival of the Fittest 3:41 Evolution & Speciation 4:22 Evidence for Evolution 4:48 Summary of Evolution *** PLAYLISTS *** https://youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh&si=orIUwL3o2jOoiYjT https://youtube.com/playlist?list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g&si=DcihOwUkd9oWbbdp https://youtube.com/playlist?list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W&si=Y8MsO-FK948jnxpS https://youtube.com/playlist?list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7&si=-7i5Iq7yOeJrhtu6 https://youtube.com/playlist?list=PLidqqIGKox7VKJD2WxRhoKaI6JGLVean8&si=NH_Q1ujhVgACM2FU #GCSE #Biology #study #revision #school #exam #AQA #OCR #Edexcel #IGCSE #IB #AP