SAT Subject Biology Practice Question 92: Answer and Explanation

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Question: 92

2. The following change is an example of which type of mutation?

Original DNA sequence: ATGGA-AGC

New DNA sequence: ATTGACAGC

I. Point mutation

II. Deletion

III. Frameshift

A. I only
B. II only
C. III only
D. I and II
E. I and III

Correct Answer: C


A point mutation refers to a DNA mutation where a single base is changed. A frameshift mutation occurs when bases are inserted or deleted, and the entire reading frame changes. The example shows an insertion that results in a frameshift.

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