CELL DIVISION. ESSENTIAL QUESTION How do cells divide to create new cells?

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Presentation transcript:

CELL DIVISION

ESSENTIAL QUESTION How do cells divide to create new cells?

MITOSIS A cell divides by copying its DNA, then splitting nucleus & cytoplasm. Allows organisms to grow & repair. One division that creates 2 identical daughter cells.

MEIOSIS Produces the gametes (cells) used in reproduction. Two sets of divisions creating 4 daughter cells with half chromosomes.

BINARY FISSION A form of asexual reproduction because there is only one parent. Used by organisms like bacteria. Offspring are genetically identical to the parent.

DATA – MITOSIS PHASEDESCRIPTIONPICTURE 1. Interphase The time between cell divisions when the cell is growing. The DNA is not visible.

DATA – MITOSIS PHASEDESCRIPTIONPICTURE 2. Prophase Chromosomes condense and become visible. The nucleus breaks down.

DATA – MITOSIS PHASEDESCRIPTIONPICTURE 3. Metaphase Chromosomes line up across center of the cell. Spindles (arms) attach the chromosomes to the centrioles.

DATA – MITOSIS PHASEDESCRIPTIONPICTURE 4. Anaphase The chromatids are pulled apart and move to opposite ends of the cell.

DATA – MITOSIS PHASEDESCRIPTIONPICTURE 5. Telophase & Cytokinesis Chromosomes separate and a new nucleus forms around each end of the cell. Cell membrane begins to separate into two new cells.

MITOSIS

ANALYSIS 1.While slicing an apple, you accidentally cut your finger. Through which process will your injury heal – mitosis or meiosis? Explain your answer. 2.Mitosis is not a process for – a)Growth b)Repair c)Reproduction 3.Why is mitosis like a cycle? 4.What is the final product of meiosis? 5.Predict what could happen if mitosis went unregulated and caused cells to divide uncontrollably.

CELL DIVISION – NOTEBOOK 6. Record the correct card numbers in this table in your lab notebook. Type of DivisionNumber(s) Mitosis Meiosis Binary Fission

CELL DIVISION – NOTEBOOK Same page in notebook – Mitosis Cookie Lab You do NOT have to draw a big chart, but make the steps of mitosis organized. Once you get the steps on the cookies correct, raise your hand so I can initial that it has been done. Then eat cookies