Assertion (A) : Replication of DNA during cell cycle occur in S-phage of interphase.
Reason (R) : Centriole duplication occurs in nucleus during S-phase of interphase.
In the light of the above statements, choose the most appropriate answer from the options given below :

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(A) is correct but (R) is not correct

If (A) & (R) both are correct and (R) is the correct explanation of (A).

If (A) & (R) both are correct but (R) is not the correct explanation of (A).

(A) is not correct but (R) is correct.

answer is B.

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Detailed Solution

Assertion (A) is correct. DNA replication occurs during the S-phase of interphase, which precedes cell division. It is during this phase that the cell's DNA is duplicated to ensure each daughter cell receives a complete set of genetic material.

Reason (R) is incorrect. Centrioles are small, cylindrical organelles found in animal cells, usually located near the nucleus in the centrosome. However, centriole duplication does not occur in the nucleus; instead, it occurs in the cytoplasm, adjacent to the pre-existing centrioles. The duplication of centrioles occurs during the S-phase of interphase, but it is not within the nucleus.

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