NEETBiologyMolecular Basis of InheritanceMCQ+4 / −1
What would happen if in a gene encoding a
polypeptide of 50 amino acids, 25th codon
(UAU) is mutated to UAA ?
- AA polypeptide of 49 amino acids will be formed
- BA polypeptide of 25 amino acids will be formed
- CTwo polypeptides of 24 and 25 amino acids will be formed
- DA polypeptide of 24 amino acids will be formed
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Correct answer: D
UGA, UAG and UAA are three non sense (or termination) codon which do not code for any amino acid. If in a gene encoding a polypeptide of 50 amino acid, 25th codon is mutated to UAA or any of the termination codon, then the chain will be terminated at that place because it will become difficult for tRNA to bring amino acid from amino acid pool. So in that case a polypeptide of 24 amino acids will be formed.
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