GCSE Biology - Selective Breeding

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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

*** PLAYLISTS ***






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