Why do cells divide ppt

Show More. Views Total views. Actions Shares. No notes for slide. Cell Division Mitosis and Meiosis 1. Cell Division What is it? Why do Cells do it? Why is it important to me? Phases of Mitosis 5. Next step — Mitosis Mitosis: Cell Division The last part of the Cell Cycle is called Mitosis and has 4 phases during which the cell divides into 2 cells The chromosomes become visible 4.

The spindle apparatus forms and attaches to the centromeres of the chromosomes The duplicated chromosomes line up along the cell's equator. Anaphase The third phase of Mitosis Diploid sets of daughter chromosomes separate They are pushed and pulled toward opposite poles of the cell by the spindle fibers Spindle Fibers Telophase The nuclear membrane and nucleoli nucleus reform. Cytokinesis is nearly complete, The Cell Plate begins to form The Cell prepares for finial division Cytokinesis — The final stage of Mitosis The cytoplasm, organelles, and nuclear material are evenly split and two new cells are formed.

Cell Plate The two new cells — each exactly like the other — are called Daughter Cells Quick Review: The following slides are drawings of the stages of Mitosis.

On your notes, please draw each phase and label it. Interphase — The Cell spends the majority of its life here, growing and functioning.

In Early Prophase of Mitosis the Chromosomes get small, centrioles move to the poles of the nucleus, and spindle fibers develop Pair of Centrioles Spindle Fibers Chromosomes consisting of 2 Sister Chromatids Late Prophase happens when the Nuclear Envelope disintegrates and spindle fibers begin to move Chromosomes toward the center of cell.

Spindle Fibers Chromosomes During Metaphase the Chromosomes line up across center of the cell, also called the equator, or Metaphase plate. In Anaphase the Chromatids that make up each Chromosome move apart and travel to opposite ends of cellular spindle Daughter Chromosomes Chromosome Chromatid In Telophase an envelope surrounds each set of Chromatids to form new Nucleus and the Cytoplasm starts to divide Cleavage Furrow Cytokinesis takes place when the Cytoplasm divides and two cells with identical genetic material are formed Daughter Cells Why Do Cells Divide?

The larger a cell becomes, the more demands the cell places on it's DNA. It also has more trouble moving enough food and wastes across its cell membrane.

The bigger the cell gets the harder it becomes to move food and waste across the membrane Food goes in Waste goes out This happens because the surface area and volume ratio does not stay the same as the cell size increases. Protein Pumps The cell's ability to either get substances from the outside or eliminate waste from the inside is related to the surface area of the cell membrane.

How much food and other material is required, and how much waste the cell produces and has to get rid of, is related to the volume of the cell. As a cell gets bigger there comes a time when its surface area is not large enough to meet the demands of the cell's volume and the cell stops growing.

So, once cells reach a certain size they must divide in order to continue to function — or they will no longer be able to take in nutrients and eliminate waste. Why Is Cell Division Important? All Living Things are made of Cells All Cells come from pre existing Cells You are a living organism, made of cells. In order to keep living, your cells must stay alive. In order for cells to keep living, they must divide and multiply Meiosis Takes place in the Gametes of an organism People have a Chromosome count of 46 When an egg joins a sperm the count must stay at 46 to remain human So, the egg can only have 23 chromosomes, and the sperm can only have 23 chromosomes But, the integrity of the organism must be maintained.

How does this happen? At the end of Meiosis the individual Gamete cell has divided from one cell to four. Males produce 4 viable sperm. Females produce 1 viable egg and 3 non functioning polar bodies. Meiosis ensures that all living organisms will maintain both Genetic Diversity and Genetic Integrity Total views , On Slideshare 0.

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Download Now Download Download to read offline. David Young Follow. Tissues organs and systems r2. Prokaryotes Vs Eukaryotes.

Cell theory and organelles r1. Specialized Cells, Biology. Mitosis study guide answers. Ths general biology unit 4 heredity cell cycle notes. Cell Division Mitosis and Meiosis. Related Books Free with a 30 day trial from Scribd. Related Audiobooks Free with a 30 day trial from Scribd. Elizabeth Howell. Views Total views. Actions Shares. No notes for slide. Cells and SystemsWhy do cells divide? Why do cells divide? Why Do Cells Divide?

Think about. How Do Cells Divide? What is cancer?