Question

the dna sequence reads acg ttcatt before a mutation occurs. after the mutation, the dna sequence reads atcg ttcatt. which type of mutation occurred? substitution insertion deletion point

Explanation:

A substitution mutation replaces one nucleotide with another. Here, the 'C' in the original DNA sequence ACG TTC ATT is replaced with 'T' in the mutated sequence ATC TTC ATT. Insertion adds nucleotides, deletion removes them, and a point mutation is a more general term that includes substitution but we are specifically asked for the type which is substitution in this case.

Answer:

substitution