Why is DNA duplicated well before cell division?

Solution: DNA duplication during S phase ensures that both daughter cells receive identical genetic information necessary for proper structure and function, maintaining genomic integrity.

Explanation:

• S phase occurs during interphase (before M phase)
• DNA replication produces sister chromatids joined at the centromere
• Each daughter cell receives a complete genome (2n → 2n in mitosis)
• Prevents aneuploidy (abnormal chromosome numbers)