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NEET2019Botany-Genetics

NEET 2019 Botany Mutations MCQ Question

Type: MCQ-conceptual-Hard-Class 12

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

A

Insertion of A and G at $4^{th}$ and $5^{th}$ positions respectively

B

Deletion of GGU from $7^{th}$ , $8^{th}$ and $9^{th}$ positions

C

Insertion of G at $5^{th}$ position

D

Deletion of G from $5^{th}$ position

Correct Answer

Option B

Detailed Explanation

Deletion of a complete codon (three nucleotides) does not alter the reading frame, hence the sequence remains in frame.

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