Question

the table contains the dna sequence for a segment of the human insulin gene and the same dna
original sequence \tatg cgc ctc ctg ccc ctg ctg gcg
mutated sequence \tatg cgc ctc ctt ccc ctg ctg gcg
which type of mutation occurred in the original sequence to generate the mutated sequence?
○ insertion
○ substitution
○ inversion
○ deletion

Explanation:

Compare the original and mutated DNA sequences. In the original sequence, there is "CTG", and in the mutated sequence, it is "CTT". One base (G) is replaced by another base (T). This is a substitution mutation, where one nucleotide is swapped for another. Insertion would add a base, deletion would remove a base, and inversion would reverse the order of bases. Since only a single - base replacement occurs, it is a substitution.

Answer:

substitution