Question

question 8 of 10
during dna replication, an extra cytosine base is added to the dna. what
type of mutation is this?
a. silent mutation
b. point mutation
c. nondisjunction mutation
d. frameshift mutation

Explanation:

A frameshift mutation occurs when nucleotides are inserted or deleted (not in multiples of three), shifting the reading frame. Adding an extra cytosine (a nucleotide) disrupts the triplet codon reading frame. A silent mutation doesn't change the amino - acid (due to codon degeneracy). A point mutation is a single - base substitution. Nondisjunction is about chromosome separation errors (not nucleotide - level like here). So, adding an extra base (insertion) leads to a frameshift mutation.

Answer:

D. Frameshift mutation