Question

the dna sequence reads acgttcatt before a mutation occurs. after the mutation, the dna sequence reads atcgttcatt. which type of mutation occurred?

insertion

point

Explanation:

Step1: Analyze DNA sequences

Original: ACGTTCATT (length 8)
Mutated: ATCGTTCATT (length 9)

Step2: Identify mutation type

Insertion adds a nucleotide. Here, a 'T' is inserted at position 2 (original: A C...; mutated: A T C...), increasing length. Point mutation changes one nucleotide (no length change). So it's insertion.

Answer:

insertion