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NEET 2019
Exam
NEET
Year
2019
Subject
Zoology
Chapter
Molecular Basis of Inheritance

NEET 2019 · Zoology · Molecular Basis of Inheritance

Under which of the following conditions will there be no change in...

Under which of the following conditions will there be no change in the reading frame of the following mRNA?
5'AACAGCGGUGCUAUU 3'

Options

  1. AInsertion of G at 5th{5}^{th} position
  2. BDeletion of G from 5th{5}^{th} position
  3. CInsertion of A and G at 4th{4}^{th} and 5th{5}^{th} positions respectively
  4. DDeletion of GGU from 7th{7}^{th} 8th{8}^{th} and 9th{9}^{th} positions

Correct answer

D. Deletion of GGU from 7th{7}^{th} 8th{8}^{th} and 9th{9}^{th} positions

Step-by-step solution

Genetic codes are read in the sequence of 3. Insertion or deletion of a single base changes the reading frame of codon and is called frameshift mutation. However, insertion or deletion of three or its multiple bases insert or delete in one or multiple codon hence one or multiple amino acids and reading frame remains unaltered from that point onwards.
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