GCSE Biology (9-1) - GCSE Biology - Selective Breeding (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. Definition of Selective Breeding * Breeding organisms with desirable characteristics to produce offspring with improved traits. 2. History and Application * Use in agriculture (farming) for thousands of years. * Modern examples: high-yield cows, disease-resistant crops, domestic pets, ornamental flowers. 3. The Process of Selective Breeding * Selecting individuals with desired traits from existing stock. * Breeding these selected individuals together. * Repeating the process over many generations to enhance the desired characteristics. * Example: The development of modern sweetcorn from its wild ancestor. 4. Drawbacks of Selective Breeding * Reduction of the gene pool (the variety of different alleles in a population). 5. Consequences of Reduced Gene Pool * Inbreeding: Breeding closely related individuals. * Increased risk of offspring inheriting genetic defects or diseases (e.g., specific dog breeds). * Reduced variation within the population. * Increased vulnerability of the entire population to new diseases or environmental changes (e.g., potential crop failure). *** CHAPTERS *** 0:00 What is Selective Breeding? 0:22 History and Examples of Use 0:56 How Does Selective Breeding Work? 1:36 Example: Development of Sweetcorn 2:04 Drawbacks of Selective Breeding *** 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