Question

genetic variation from errors quick check
a dna segment has base order agc tta tcg. which copy exhibits a frameshift mutation through deletion? (1 point)
agc tcg
agc tta tag
tta tcg
agc ttt cg

Explanation:

A frameshift mutation through deletion occurs when a nucleotide is removed, shifting the reading frame. The original sequence is AGC TTA TCG. Let's analyze each option:

• AGC TCG: Removes "TTA" (a whole codon, so it's not a frameshift as the reading frame remains in - frame per codon).
• AGC TTA TAG: Changes "TCG" to "TAG" (a substitution, not a deletion - based frameshift).
• TTA TCG: Removes "AGC" (a whole codon, so no frameshift).
• AGC TTT CG: Removes one nucleotide from "TTA" (now "TTT"), causing a frameshift as the reading frame for subsequent codons is altered.

Answer:

AGC TTT CG