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hardMCQNEET 20192026Biology
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Under which of the following conditions will there be no change in the reading frame of following mRNA? AACAGCGGUGCUAUU

  1. A
    Insertion of G at 5th position
  2. B
    Deletion of G from 5th position
  3. C
    Insertion of A and G at 4th and 5th positions respectively
  4. D
    Deletion of GGU from 7th, 8th and 9th positions

Solution & Step-by-step Explanation

Reading frame is determined by codons (groups of 3 bases).Insertion or deletion of 1 or 2 bases (Options A, B, C) shifts the entire reading frame (frameshift mutation).Deletion (or insertion) of exactly 3 bases (or multiples of 3) removes (or adds) one entire codon but does not change the reading frame for the rest of the sequence. GGU is one codon.

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Try it yourself before checking the explanation above.

Under which of the following conditions will there be no change in the reading frame of following mRNA? AACAGCGGUGCUAUU
A
Insertion of G at 5th position
B
Deletion of G from 5th position
C
Insertion of A and G at 4th and 5th positions respectively
D
Deletion of GGU from 7th, 8th and 9th positions

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