Which evolutionary change would be most likely to require adding gaps in a sequence alignment?

Question

Quizplus · Accepted Answer

An insertion, as the name suggests, involves the addition of one or more nucleotides to a DNA sequence. This can result in gaps in the sequence alignment because the inserted nucleotides will not have a corresponding base in the other sequences being aligned. Therefore, an insertion is the most likely evolutionary change to require adding gaps in a sequence alignment.

Which Evolutionary Change Would Be Most Likely to Require Adding