The dna sequence reads acgttcatt before a mutation occurs. after the mutation, the dna sequence reads atcgttcatt. which type of mutation occurred? a. substitution b. insertion c. deletion d. point

let's compare the two sequences more directly, they both start with "A" but then the first one has "C" while the second has "T"... but in the second after "T" we have "C" again! and then both have "CGTTCATT" - so it just seems that "T" was inserted into the second sequence - this is the correct option (insertion) I hope that my answer is helpful! Let me know if you need something more :)

Your answer will be b action plan.