CBSE 2025, Set 1

Question

Assertion (A): One of the property of genetic code is degeneracy.
Reason (R): Some amino acids can be coded by more than one codon.

Select the correct option: A). Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A). B). Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of (A). C). Assertion (A) is true, but Reason (R) is false. D). Assertion (A) is false, but Reason (R) is true.

Edvaya · Accepted Answer

The correct answer is Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).. **SOLUTION** The Assertion is true: The genetic code exhibits **degeneracy**. The Reason is also true and is the exact definition of this property: Because there are 64 codons and only 20 standard amino acids, **some amino acids are coded by more than one codon** (e.g., Leucine is coded by 6 different codons). Therefore, Reason (R) correctly explains Assertion (A).

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Biology > Reproduction And Genetics > Molecular Basis Of Inheritance

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