Mutations, DNA Repair, and Genetic Variation
Changes in Genetic Information
What Is a Mutation?
A mutation is a change in the DNA sequence. Some mutations have little effect, some are harmful, and some can be beneficial depending on the context.
Sources of Mutation
Mutations can happen during DNA replication, from environmental damage, or from chemical and physical influences such as radiation or certain mutagens.
DNA Repair
Cells have repair systems that detect and fix many types of DNA damage. These systems help protect the genome and reduce errors.
Variation Terms
What is a mutation?
Mutations are changes in the nucleotide sequence of DNA.
Correct answer: A change in DNA sequence
Why are DNA repair systems important?
Repair systems protect genetic information.
Correct answer: They help fix damage and reduce harmful errors in the genome.
Which of the following can cause mutations?
Radiation is one example of an environmental factor that can damage DNA.
Correct answer: Radiation