Question

genetic mutations produce variation quick check
examine the two strands of dna below. which kind of mutation occurred?
original strand: agc gta ccc tac
new strand: agc gta acc tac
(1 point)
○ deletion
○ frameshift
○ substitution
○ insertion

Explanation:

To determine the mutation, we compare the original and new DNA strands. The original has "CCC" and the new has "ACC" at the relevant position. A substitution mutation involves replacing one nucleotide (or a set) with another. Here, the 'C' in "CCC" (specifically one 'C'? Wait, no—looking at the triplets: original triplet is CCC, new is ACC. So the first 'C' of CCC is replaced with 'A'? Wait, no, let's check the triplets. Original: AGC, GTA, CCC, TAC. New: AGC, GTA, ACC, TAC. So the third triplet changes from CCC to ACC. So one nucleotide (the first 'C' in CCC) is substituted with 'A'? Wait, no, CCC to ACC: the first base (C to A) is substituted. Deletion would remove a base, insertion add, frameshift is due to insertion/deletion causing a shift. Here, only one base (in the triplet) is changed, so substitution.

Answer:

substitution (the option corresponding to substitution, e.g., if the options are labeled, say the option with "substitution" text)