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 **    • GCSE Maths (9-1)      • GCSE Biology (9-1)      • GCSE Chemistry (9-1)      • GCSE Physics (9-1)      • A-Level Biology   #GCSE #Biology #study #revision #school #exam #AQA #OCR #Edexcel #IGCSE #IB #AP