Скачать или смотреть GCSE Biology - Selective Breeding (2026/27 exams)

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** 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

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