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Q.

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

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a

A polypeptide of 24 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

answer is A.

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Detailed Solution

Translation cannot occur once STOP codon appears.

 if in a gene encoding a  polypeptide of 50 amino acids, 25th codon  (UAU) is mutated to UAA ,a polypeptide of 24 amino acids will be formed 

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