Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
Variation refers to the differences in genetic and phenotypic traits among individuals within a population. These differences are crucial for the process of natural selection and evolution.
5 Must Know Facts For Your Next Test
Variation can occur due to mutations, gene flow, sexual reproduction, or environmental factors.
Genetic variation is essential for the survival and adaptability of a species.
Phenotypic variation can be influenced by both genetic makeup and environmental conditions.
Natural selection acts on variation present in a population, leading to evolutionary change over time.
There are two main types of variation: continuous (e.g., height) and discontinuous (e.g., blood type).
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Related terms
Mutation: A change in the DNA sequence that can lead to genetic diversity within a population.
Gene Flow: The transfer of genetic material between different populations which can introduce new variations.
Natural Selection: The process where organisms with favorable traits are more likely to survive and reproduce, driving evolutionary changes.