7: Cell Division
- Page ID
- 24769
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- 7.1: Introduction
- The cell cycle refers to a series of events that describe the metabolic processes of growth and replication of cells. The bulk of the cell cycle is spent in the “living phase”, known as interphase. Interphase is further broken down into 3 distinct phases: G1 (Gap 1), S (Synthesis) and G2 (Gap 2). G1 is the phase of growth when the cell is accumulating resources to live and grow.
- 7.2: Mitosis (Activity)
- Cells in your body reproduce at different rates. Skin cells reproduce frequently (about once per day); liver cells reproduce rarely (about once per year). Some specialized cells (like nerve and muscle cells) almost never reproduce and are in a special stage called G0. The whole process of mitosis, prophase to telophase, takes approximately 90 minutes. This exercise uses onion root tips to illustrate the amount of time spent in each phase of mitosis.
- 7.3: Modeling Mitosis and Meiosis (Activity)
- In this page, you will find the instructions on how to simulate mitosis using pop-beads. Pop-beads are small, colored beads that can be joined together to simulate chromosome strands. We will use the pop-it beads to simulate the process that chromosomes undergo during cell division.
- 7.4: Chromosomes and Karyotypes
- Chromosomes in Interphase are not visible individually. In preparation for nuclear division (mitosis or meiosis), they begin to organize tighter and condense in preparation for movement to subsequent daughter nuclei. The animation below illustrates the process of histone packaging and the molecular visualization of DNA replication. Histones are proteins that aid in the packaging of the chromosomes into organized coils that give rise to the recognizable chromosomes during metaphase.