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