Assertion :A change in nitrogen base at the third position of a codon causes change in the expression of the codon. Reason: A codon is mostly read by all the three nitrogen bases.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
According to the Wobble hypothesis, only the first two position of a triplet codon on mRNA have a precise pairing with the bases of the (RNA anticodon. The pairing of the third position bases of the codon may be ambiguous and varies according. to the nucleotide present in this position. Thus, a single tRA type is able to recognize two or more codons differing only in the third base. The same is called wobble position.
So, the correct answer is 'Both Assertion and Reason are incorrect
SOLUTION'.

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