What would happen if in a gene encoding a polypeptide of 50 amino acids, the 25th codon UAU mutated to UAA:

A polypeptide of 24 amino acids will be formed

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Two polypeptides of 24 and 25 amino acids will be formed

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A polypeptide of 49 amino acids will be formed

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A polypeptide of 25 amino acids will be formed

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Solution

The correct option is A
A polypeptide of 24 amino acids will be formed

UAU codes for tyrosine and UAA is the stop codon. Therefore at 25th amino acid, the synthesis of polypeptide would stop. So, a polypeptide of 24 amino acids is formed.

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