Activity #44 PHASES OF THE CELL CYCLE

6 Phases of the Cell Cycle Interphase Prophase Metaphase Anaphase Telophase Cytokinesis

1. Interphase The cell doubles in size DNA Replicates Longest phase

1. Interphase Chromatin Nuclear Membrane

The process of the cell’s nucleus dividing during Prophase-Telophase Mitosis Mitosis is subdivided into four phases: Prophase, Metaphase, Anaphase, and Telophase The process of the cell’s nucleus dividing during Prophase-Telophase

2. Prophase Mitosis begins (nucleus divides). Centrioles appear Spindle fibers form. Chromatin forms Chromosomes ***Each chromosome consists of two sister chromatids attached together by a centromere by the end of this stage. -chromatid = half of a copied chromosome

2. Prophase Centrioles Spindle fibers Nuclear Membrane

3. Metaphase centrioles Spindle fibers Chromosome Nuclear membrane has disappeared. Chromosomes line up along the middle of the cell. Spindle fibers attach to centromeres of each chromosome. centrioles Spindle fibers Chromosome

4. Anaphase Spindle fibers centrioles Chromosomes Chromatids split Spindle fibers pull chromosomes to opposite ends of the cell.

5. Telophase centrioles Spindle fibers Nuclei Chromosome Two new nuclei form around chromosomes Chromosomes return to chromatin form. Mitosis ends. (nucleus has been divided)

6. Cytokinesis Cell membrane pinches and forms identical daughter cells After cytokinesis, interphase begins again.

Cell doubles in size; DNA is copied Cell Cycle Phases Stage Name Process 1 Interphase Cell doubles in size; DNA is copied Mitosis The process of the cell’s nucleus dividing during prophase-telophase Prophase Mitosis begins; nuclear membrane disappears 2 Metaphase Chromosomes line up along the equator of the cell 3 Anaphase Chromatids split and are pulled to each pole of cell 4 Telophase Nuclear membrane reforms; cell begins to pinch together. Mitosis ends 5 Cytokinesis Parent cell’s cytoplasm divides, forming 2 identical daughter cells 6

Videos https://www.youtube.com/watch?v=NR0mdDJMHIQ