Question

the dna sequence reads acgtttcatt before a mutation occurs. after the mutation, the dna sequence reads acgtttcatl. what type of mutation occurred?
substitution
insertion
deletion
point

Explanation:

A substitution mutation replaces one nucleotide with another. An insertion mutation adds one or more nucleotides. A deletion mutation removes one or more nucleotides. A point mutation can be a substitution, insertion or deletion at a single - base level. Comparing the original and mutated DNA sequences, a single - base change has occurred, which is a substitution mutation.

Answer:

A. substitution