Biology · CELL CYCLE AND CELL DIVISION

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): During the S phase of the cell cycle, the amount of DNA per cell doubles from 2C to 4C, but the chromosome number remains unchanged (2n). Reason (R): DNA replication creates duplicate copies of the DNA molecules, which remain attached as sister chromatids at a single centromere. In the light of the above statements, choose the correct answer from the options given below:

1. A
   Both (A) and (R) are true and (R) is the correct explanation of (A).
2. B
   Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
3. C
   (A) is true but (R) is false.
4. D
   (A) is false but (R) is true.