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This lesson covers the causes and types of variation — the differences that exist between individuals of the same species. Understanding variation is essential for understanding evolution and natural selection. For AQA GCSE Biology, you need to know the difference between genetic and environmental variation, and how they interact.
Variation refers to the differences between individuals within a species. No two individuals are exactly alike — even identical twins show some differences due to their environments.
Variation can be caused by:
Genetic variation is caused by differences in the genes (and alleles) that organisms inherit from their parents. There are several sources of genetic variation:
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