Spontaneous mutation

Definition

A spontaneous mutation is a change in the genetic sequence that occurs without external influence, typically during DNA replication. These mutations can lead to variations within microbial populations.

5 Must Know Facts For Your Next Test

1. Spontaneous mutations occur at a relatively low but constant rate.
2. They can result from errors in DNA replication, spontaneous lesions, or transposable elements.
3. Spontaneous mutations can be beneficial, neutral, or harmful to the organism.
4. These mutations contribute to genetic diversity within microbial communities.
5. Natural selection acts on these mutations, influencing microbial evolution.

Review Questions

• What are the primary causes of spontaneous mutations?
• How do spontaneous mutations contribute to genetic diversity in microbes?
• Why are spontaneous mutations important in the context of microbial evolution?

Related terms

Induced Mutation: A change in the genetic sequence caused by external factors such as chemicals or radiation.

DNA Replication: The process by which a cell duplicates its DNA before cell division.

Genetic Diversity: The total number of genetic characteristics in the genetic makeup of a species.