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AIPMT PRELIMS2003Botany-Genetics

AIPMT PRELIMS 2003 Botany Gene Mutation MCQ Question

Type: MCQ-conceptual-Medium-Class 12

What would happen if in a gene encoding a polypeptide of 50 amino acids, $25^{th}$ codon (UAU) is mutated to UAA :-

A

A polypeptide of 25 amino acids will be formed

B

Two polypeptides of 24 and 25 amino acids will be formed

C

A polypeptide of 49 amino acids will be formed

D

A polypeptide of 25 amino acids will be formed

Correct Answer

Option A

Detailed Explanation

UAA is a stop codon, so the polypeptide chain will terminate prematurely at the $25^{th}$ amino acid, resulting in a shorter polypeptide.

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