Addition mutation
This is an addition mutation because the mutated strand has an additional one nucleotide (cytosine) at the end.
Explanation:
This kind of mutation , including deletion mutations, are lethal because they cause a frameshift mutation. Frameshift mutation are a change in codon sequences downstream of a mutation. This causes different amino acids to be coded by the different codons hence changing the translated protein.
Learn More:
For more on mutations check out;
https://brainly.com/question/1343509
https://brainly.com/question/12334066
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