Question

Below is a segment of a strand of normal DNA:

ATA GCA TGA

If the DNA sequences changes to:

AAT AGC ATG A

Answer 1

This would be an example of:
C) an insertion mutation.

Notice how the sequence contains the same letters as before, only an A is added to the beginning. Adding extra nucleotides is an example of an insertion mutation, a type of frame-shift also, because the reading frame will be thrown off downstream.