In the cell cycle it is necessary for interphase to happen before mitosis and cytokinesis creates 2 identical cells. Why is interphase neccessary? What is 1 major reason that mitosis wouldn't work without interphase happening first? INTERPHASE G, (DNA synthesis) Cytokinesis MITOTIC G2 PHASE (M) C Mitosis
In the cell cycle it is necessary for interphase to happen before mitosis and cytokinesis creates 2 identical cells. Why is interphase neccessary? What is 1 major reason that mitosis wouldn't work without interphase happening first? INTERPHASE G, (DNA synthesis) Cytokinesis MITOTIC G2 PHASE (M) C Mitosis
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
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Transcribed Image Text:**Understanding the Importance of Interphase in the Cell Cycle**
**Question:**
In the cell cycle, it is necessary for interphase to happen before mitosis and cytokinesis creates 2 identical cells. Why is interphase necessary? What is 1 major reason that mitosis wouldn't work without interphase happening first?
**Answer:**
Interphase is a critical phase of the cell cycle where the cell prepares itself for division. It occurs before the phases of mitosis and cytokinesis, where the cell actually divides to form two identical daughter cells. Interphase consists of three distinct stages: G1 (Gap 1), S (Synthesis), and G2 (Gap 2).
1. **G1 Phase (Gap 1):** During this stage, the cell grows in size, produces RNA, and synthesizes proteins essential for DNA replication.
2. **S Phase (Synthesis):** In this phase, DNA replication occurs, ensuring that each daughter cell will receive an identical set of chromosomes.
3. **G2 Phase (Gap 2):** This stage involves further cell growth and production of proteins, preparing the cell for mitosis.
The accompanying diagram depicts the cell cycle, highlighting the interphase (G1, S, and G2 phases) and the subsequent mitotic phase (M). The diagram is segmented to show the transitions between each phase and illustrates the cell's preparation and replication processes.
**One Major Reason Interphase is Essential:**
- **DNA Replication:** Without interphase, particularly the S phase, the cell would not replicate its DNA. This means that during mitosis, the daughter cells would not receive a full set of genetic material. DNA synthesis during interphase ensures that each daughter cell inherits identical and complete sets of chromosomes, which is fundamental for the proper functioning and genetic continuity of cells.
Understanding interphase emphasizes the preparation required for successful cell division and genetic fidelity. Ensuring this preparation through interphase is what enables mitosis to proceed correctly, facilitating the growth, development, and maintenance of all living organisms.
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