Q160 / 180 · AIIMS 2002 · Zoology

Frameshift mutation occurs when

  • A
    base is subsituted
  • Correct answer
    B
    base is deleted or added
  • C
    anticodons are absent
  • D
    none of these.

Solution

Frameshift mutation occurs when one or more nucleotides are either added or deleted from DNA. Example of frameshift mutation due to deletion is as follows: Original (wild type) message or reading frame CAT GAT CAT GAT CAT GAT CAT After Deletion CAT GAT ATG ATC ATG ATC AT Message out of frame

Hence, the correct answer is option: 'B'.

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