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AUG is known as the initiation codon and...

AUG is known as the initiation codon and UAA, UAG and UGA are known as termination codons. Then what are non-sense codons?

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UAA, UAG and UGA, the stop codons do not specify any aminoacid. So they are also known as non-sense codons.
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AUG is known as the initiation codon. Give reason

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