Question

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

Explanation:

• Substitution: A single nucleotide is replaced by another. In the given DNA sequences, the first nucleotide 'A' in the original sequence "ACGTTCATT" is replaced by 'T' in the mutated sequence "ATCGTTCATT". This is a classic example of substitution.
• Insertion: Would involve adding an extra nucleotide(s), which is not the case here.
• Deletion: Would involve removing a nucleotide(s), which is not the case here.
• Point mutation: While substitution is a type of point mutation, the more specific and direct answer among the options provided (since substitution is an option) is substitution.

Answer:

substitution