Genetic variability

Definition

Genetic variability is the measure of the tendency of individual genotypes within a population to vary from one another. It is a fundamental aspect of evolution and adaptation in populations.

5 Must Know Facts For Your Next Test

1. Genetic variability is essential for natural selection to drive evolutionary changes.
2. Sources of genetic variability include mutations, gene flow, and sexual reproduction.
3. High genetic variability can increase a population's ability to adapt to environmental changes.
4. Genetic drift can reduce genetic variability in small populations.
5. Balancing selection can maintain genetic variability within a population.

Review Questions

• What are the primary sources of genetic variability?
• How does genetic drift affect genetic variability?
• Why is genetic variability important for the process of natural selection?

Related terms

Mutation: A change in the DNA sequence that can introduce new genetic variations.

Gene Flow: The transfer of alleles or genes from one population to another.

Genetic Drift: Random changes in allele frequencies which can lead to significant effects in small populations.