Answer: Indel (Insertion)
This position in the alignment shows where there is an indel. It was likely a loss of a base in sequence 3, because this would involve only a single mutation event, rather than two identical insertions in sequences 1 and 2.
This position in the alignment shows where there is an indel. It was likely a loss of a base in sequence 3, because this would involve only a single mutation event, rather than two identical insertions in sequences 1 and 2.