Discussion
Assertion (A): The DNA content of a cell doubles in S phase while its chromosome number does not.
Reason (R): Replication gives each chromosome a second chromatid rather than creating a new chromosome.
Answer: C
Both are true and the reason resolves the apparent paradox: a chromosome is counted by its centromeres, and replication produces two chromatids sharing one centromere until anaphase separates them. Counting by centromeres keeps the two quantities straight.
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