Question

A DNA segment has base order TCG TAT AAC. Which copy exhibits an insertion mutation without a frameshift?
A. TCG CCG TAT AAC
B. TCG TAT GAAC
C. TCC TAT AAC
D. TCG TAT AC

Answer 1

A. TCG CCG TAR AAC

Explanation:

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Answer 2

The nucleotide sequence TCG CCG TAT AAC exhibits an insertion mutation without a frameshift (Option A).

• A mutation is any alteration in the nucleotide (DNA) sequence of the genome of an organism.

• An insertion mutation is a type of mutation where one or more nucleotide bases are added to the original sequence.

• A frameshift mutation is a type of mutation that alters the open reading frame of the nucleotide sequence, thereby modifying the linear order of amino acids that will be added from the new nucleotide sequence.

• An insertion mutation of three consecutive nucleotides does not modify the open reading frame of the sequence because they encode for a new codon.

In conclusion, the nucleotide sequence TCG CCG TAT AAC exhibits an insertion mutation without a frameshift (Option A).

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