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Molecular Basis of Inheritance

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  1. What would happen if in a gene encoding a polypeptide of 50 amino acids, 25th codon (UAU) is mutated to UAA?
    1. A polypeptide of 25 amino acids will be formed
    2. A polypeptide of 24 amino acids will be formed
    3. Two polypeptides of 24 and 25 amino acids will be formed
    4. A polypeptide of 49 amino acids will be formed
Correct Option: B

UAA is the stop codon. Therefore at 25th amino acid the synthesis of polypeptide stops. So, a polypeptide of 24 Amino acid is formed.


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