1. DNA replication and cell division: DNA replication must occur before cell division to ensure that each daughter cell receives a complete copy of the genome. This is crucial for maintaining the genetic information and functional capacity of the cell.
2. Cell growth and division: The cell must grow in size before it divides. This ensures that the daughter cells are large enough to carry out their functions and maintain the overall size of the organism. This growth includes increasing the volume of cytoplasm and organelles.
Coordination:
These two processes are tightly coordinated to ensure that the cell size remains constant. If DNA replication is complete before the cell has grown sufficiently, the daughter cells will be smaller than the parent cell. Conversely, if the cell grows too much before division, the daughter cells will be larger than the parent cell.
Therefore, the coordination of DNA replication and cell growth is essential for maintaining a constant cell size across generations.
