Cell Cycle and Mitosis
Learning the life cycle of a cell.
1. G1- Gap 1 phase. Cell does most of it's growing in this phase.
2. S-Phase-Synthesis phase. This is the most important step of interphase because this is when DNA replication occurs. DNA replication is the process in which DNA is going to make an exact copy of itself. This is important because the end product of mitosis is 2 identical diploid cells. In order for the cells to be identical, then the DNA has to be copied at some point in the cell cycle. The S-Phase is when that happens!
3. G2- Gap 2 phase. This is when the cell starts to duplicate the organelles that are essential for cellular division.
- Nuclear envelope begins to dissappear.
- Chromatin condenses into chromosomes.
- Centrioles start to move to opposite ends of the cell.
- Spindle fibers begin to form.
1. Chromosomes line up in the middle of the cell.
2. The spindle fibers attach to the centromere (middle) of the chromosome.
1. Chromosomes will be pulled apart.
2. Sister chromatids will be pulled by shortening spindle fibers to opposite ends of the cell.
1. Nuclear membrane begins to reform.
2. Spindle fibers begin to break down.
3. Chromosomes begin to break back down into chromatin.
*When this stage is complete nuclear division is over. Cellular division still has to continue.