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A DNA segment has base order AGC TTA TCG. Which copy exhibits a frameshift mutation through deletion? (1 point)
O AGC TTT CG
AGC TCG
O AGC TTA TAG
O TTA TCG
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AGC TTT CG
Reason: The original sequence is 9 bases (AGC TTA TCG). AGC TTT CG has 8 bases (one base deleted), which is not a multiple of three and therefore causes a frameshift. The other choices remove or change whole codons (multiples of three) or substitute a base, so they do not produce a frameshift.
Reason: The original sequence is 9 bases (AGC TTA TCG). AGC TTT CG has 8 bases (one base deleted), which is not a multiple of three and therefore causes a frameshift. The other choices remove or change whole codons (multiples of three) or substitute a base, so they do not produce a frameshift.
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