Multiple Choice
In an experiment comparing DNA samples before and after exposure to a DNA-damaging agent, under which condition would the DNA bands on a gel be identical?
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17. Mutation, Repair, and Recombination
DNA Repair
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
If DNA repair mechanisms were perfect, which of the following would most likely be true?
A
The mutation rate in cells would be extremely low or nonexistent.
B
Cells would accumulate mutations at a normal rate.
C
Genetic diversity would increase due to higher mutation rates.
D
DNA replication errors would always result in permanent mutations.
Verified step by step guidance1
Understand the role of DNA repair mechanisms: these systems identify and correct errors that occur during DNA replication or due to damage, thereby reducing the mutation rate in cells.
Recognize that if DNA repair mechanisms were perfect, they would correct all errors before they become permanent mutations.
Recall that mutations arise primarily from replication errors and DNA damage that are not repaired; thus, perfect repair would prevent these mutations from accumulating.
Consider the consequences of perfect DNA repair: since mutations are the source of genetic variation, a near-zero mutation rate would mean very low or no accumulation of mutations.
Conclude that under perfect DNA repair, the mutation rate in cells would be extremely low or nonexistent, making this the most likely true statement among the options.
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