Variation

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

1. Variation can occur due to mutations, gene flow, sexual reproduction, or environmental factors.
2. Genetic variation is essential for the survival and adaptability of a species.
3. Phenotypic variation can be influenced by both genetic makeup and environmental conditions.
4. Natural selection acts on variation present in a population, leading to evolutionary change over time.
5. There are two main types of variation: continuous (e.g., height) and discontinuous (e.g., blood type).

Review Questions

• What are the primary sources of genetic variation within a population?
• How does phenotypic variation differ from genetic variation?
• Why is genetic variation important for natural selection?

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.