Final answer:
Chromosomes replicate before cell division to ensure each daughter cell has a complete set of genetic material. This process, known as DNA replication, is vital for maintaining genetic continuity and proper cell function.
Step-by-step explanation:
Why is DNA Replication Necessary Before Cell Division?
Chromosomes need to make copies of themselves before the cell divides to ensure that each resulting daughter cell has a complete set of DNA. This replication process is known as DNA replication. Without this, new cells would lack the necessary genetic information which may lead to cell malfunction or disease. DNA replication ensures that each new cell contains exactly the same DNA as the parent cell, thus sustaining the organism's genetic continuity.
During the cell cycle, mitosis enables cells to divide and generate new, genetically identical cells. Prior to mitosis, each chromosome is replicated during the S phase. This critical step ensures that when the cell divides, each daughter cell inherits a full set of chromosomes, bearing the genetic instructions needed for the cell to function.
If a cell were to divide without replicating its DNA, or if the replication was incomplete, each daughter cell would not have the full set of genetic instructions. This can lead to severe consequences including cellular dysfunction, development of diseases, or failure of the cell to survive.