Question

when the nitrogenous base adenine is replaced with cytosine in the dna sequence this mutation is known as? substitution frameshift inversion insertion deletion rewatch

Explanation:

A substitution mutation occurs when one base in a DNA sequence is replaced by another. Here, adenine is replaced by cytosine, which fits the definition of substitution. Frameshift mutations involve insertions or deletions that shift the reading frame. Inversion is a rearrangement of DNA segments, insertion adds bases, and deletion removes bases. So the correct option is Substitution.

Answer:

Substitution (the option with "Substitution" text, typically the first checkbox option in the list)