Why does a parent cell make a copy of every chromosome before it divides?

A parent cell copies every chromosome before it divides to ensure that each daughter cell receives an identical set of genetic material. This process, known as DNA replication, is crucial for maintaining genetic stability and continuity across generations of cells. By duplicating the chromosomes, the parent cell prepares to distribute an equal and complete set of genetic instructions to each new cell during division. This fundamental mechanism is essential for growth, repair, and reproduction in living organisms.