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An insertion or deletion that alters the reading frame is a:

ASilent mutation
BPoint mutation
CTransition mutation
DFrameshift mutation
Answer & Solution
Correct answer: D. Frameshift mutation
1. The protein is usually nonfunctional. 2. This is a frameshift mutation. 3. Adding three bases is less harmful than one. _Source: OpenStax Biology 2e, Chapter 14, DNA Structure and Function (CC BY 4.0)._
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