Variation

Definition

Variation is the differences in physical traits or behaviors among individuals within a population. These differences can be genetic, environmental, or a combination of both.

5 Must Know Facts For Your Next Test

1. Variation is crucial for natural selection as it provides the material for evolutionary change.
2. Genetic variation arises from mutations, gene flow, and sexual reproduction.
3. Environmental factors such as climate and diet can also cause variations within a population.
4. Phenotypic variation refers to observable traits while genotypic variation refers to genetic differences.
5. High levels of variation increase a population's ability to adapt to changing environments.

Review Questions

• What are the main sources of genetic variation in a population?
• How does phenotypic variation differ from genotypic variation?
• Why is variation important for the process of natural selection?

Related terms

Natural Selection: The process by which organisms better adapted to their environment tend to survive and produce more offspring.

Mutation: A change in the DNA sequence that can lead to genetic diversity within a population.

Gene Flow: The transfer of genetic material between separate populations, increasing genetic diversity.