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What would happen if in a gene encoding a polypeptide of 50 amino acids, the 25th codon (UAU) is mutated to UAA?
A polypeptide of 24 amino acids will be formed.
Two polypeptides of 24 and 25 amino acids will be formed.
A polypeptide of 49 amino acids will be formed.
A polypeptide of 25 amino acids will be formed.
Answers (1)
UGA, UAG and UAA are three non-sense (or termination) codons which do not code for any amino acid. If in a gene encoding a polypeptide of 50 amino acids, the 25th codon is mutated to UAA or any of the termination codons , 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. Hence, the correct answer is option 1.
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