Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In animal cells, the centriole duplicates in the nucleus during the S phase. Reason (R): During the S phase, the amount of DNA per cell doubles in the nucleus. In the light of the above statements, choose the most appropriate answer from the options given below:

Step-by-step solution

The Assertion is incorrect because in animal cells, the centriole duplicates in the cytoplasm, not the nucleus, during the S phase. The Reason is correct because the S phase (Synthesis phase) marks the period during which DNA replication occurs, leading to a doubling of the DNA content per cell within the nucleus. Therefore, the Assertion is incorrect but the Reason is correct. Answer: Assertion is incorrect but Reason is correct