IGCSE Biology - Selection (18.3)

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Cambridge IGCSE Biology (0610/0970)
Chapter 18 - Variation and selection
Topic 18.3 - Selection
For exams in 2023, 2024 & 2025 (core and extended)

As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam!

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@igpecomplete - Cambridge IGCSE PE
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Timestamps:
0:00 Contents
0:40 Natural selection
2:15 Artificial selection
3:21 Adaptation (extended)
4:03 Natural vs artificial selection (extended)

Core content:
- Describe natural selection with reference to;
(a) genetic variation within populations,
(b) production of many offspring,
(c) struggle for survival, including competition for resources,
(d) a greater chance of reproduction by individuals that are better adapted to the environment than others,
(e) these individuals pass on their alleles to the next generation.
- Describe selective breeding with reference to;
(a) selection by humans of individuals with desirable features,
(b) crossing these individuals to produce the next generation,
(c) selection of offspring showing the desirable features.
- Outline how selective breeding by artificial selection is carried out over many generations to improve crop plants and domesticated animals and apply this to given contexts.

Extended content:
- Describe adaptation as the process, resulting from natural selection, by which populations become more suited to their environment over many generations.
- Describe the development of strains of antibiotic resistant bacteria as an example of natural selection.
- Outline the differences between natural and artificial selection.