Question

The image shows an example of a deletion mutation.

An original D-N-A strand reads C-T-G-G-A-G with the first two G's crossed out. The mutated D-N-A strand reads C-T-A-G.

When did the mutation most likely occur?

Responses

before transcription

Deletion mutations occur when DNA is not copied properly during DNA replication, which occurs prior to transcription.

before transcription Deletion mutations occur when DNA is not copied properly during DNA replication, which occurs prior to transcription.

during transcription

Deletion mutations occur prior to, not during, transcription
during transcription Deletion mutations occur prior to, not during, transcription

during translation

Deletion mutations occur during DNA replication, prior to transcription and translation, not during translation
during translation Deletion mutations occur during DNA replication, prior to transcription and translation, not during translation

after translation

Deletion mutations occur during DNA replication, prior to, not after, transcription and translation.

after translation Deletion mutations occur during DNA replication, prior to, not after, transcription and translation.
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Answer 1

before transcription

Deletion mutations result from errors during DNA replication (S phase), so the change must occur before transcription and translation.