Examine the two strands of DNA below. Which kind of mutation occurred?

Question

Original strand: AGC GTA CCC TAC

New strand: AGC GTA ACC TAC

(1 point)
Responses

insertion
insertion

frameshift
frameshift

deletion
deletion

substitution
substitution

Answer 1

The original strand is: AGC GTA CCC TAC
The new strand is: AGC GTA ACC TAC

In comparing the two strands, we can see that the third codon has changed from "CCC" in the original strand to "ACC" in the new strand. This change involves the replacement of one nucleotide (the first "C" has been replaced with an "A").

This type of mutation, where one nucleotide is replaced by another, is called a substitution.

So the correct response is: substitution.