Question

select two:
when a nitrogenous base is added to the dna molecule it is which type of mutation?
insertion
substitution
deletion
frameshift
inversion
rewatch

Explanation:

1. Insertion: Adding a nitrogenous base to DNA is defined as an insertion mutation, as it inserts new genetic material.
2. Frameshift: Insertions (and deletions) of bases that are not in multiples of three cause a frameshift mutation, altering the reading frame of the genetic code. Substitution replaces a base, deletion removes a base, and inversion reverses a segment—none match "adding" a base as directly as insertion and its associated frameshift (when the insertion is not a multiple of three bases).

Answer:

A. Insertion, D. Frameshift