This is the normal nucleotide sequence on a dna strand: a—c—t—g—g—a—t what is a substitution?
a—c—t—g—c—g—a—t
a—c—t—g—a—t
a—g—t—g—g—a—t
a—c—u—g—g—a—u

Ans.

A substitution mutation can be defined as a mutation, which occurs due to exchange of a nitrogenous base for another (such as adenine to cytosine). This mutation can change the sequence of DNA and may results in a completely different gene product, sue to change in codon sequence.

The sequence 'A—G—T—G—G—A—T' represents a substitution mutation for normal nucleotide sequence as second base (cytosine) is exchanged with guanine in mutated sequence.  

Thus, the correct answer is option). 'A—G—T—G—G—A—T.'

Answer C,   A—G—T—G—G—A—T

Explanation:

I took the quiz

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the question isn't complete here so i can't right an answer '_'