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Mitosis and Meiosis

Mitosis and Meiosis. Essential Questio n: What are the similarities and differences between Mitosis and Meiosis? Objective : Students will be able to analyze the similarities and differences between the processes of Mitosis and Meiosis by completing a Venn Diagram with total accuracy. Mitosis.

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Mitosis and Meiosis

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  1. Mitosis and Meiosis • Essential Question: What are the similarities and differences between Mitosis and Meiosis? • Objective: Students will be able to analyze the similarities and differences between the processes of Mitosis and Meiosis by completing a Venn Diagram with total accuracy.

  2. Mitosis During mitosis, the contents of the nucleus divide, forming two identical nuclei.

  3. Lesson 1 The Mitotic Phase (cont.) mitosis from Greek mitos, means “wrap thread”; and Latin –osis, means “process”

  4. Mitosis

  5. Phases of Mitosis

  6. Mitosis Phases

  7. Phases of Mitosis

  8. The final phase of Mitosis In cytokinesis, the cytoplasm divides and forms two new daughter cells.

  9. The results of cell division The cell cycle is important for reproduction in some organisms, growth in multicellular organisms, replacement of worn out or damaged cells, and repair of damaged tissues. • In some unicellular organisms, cell division is a form of reproduction. • Cell division allows multicellular organisms to grow and develop from one cell.

  10. mitosis • The nucleus and its contents divide during mitosis. • The cytoplasm and its contents divide during cytokinesis.

  11. Haploid Cells • In meiosis, one diploid cell divides and makes four haploid sex cells. • Meiosis occurs only during the formation of sex cells. • Meiosis involves two divisions of the nucleus, meiosis I and meiosis II. • A reproductive cell goes through interphase before beginning meiosis I.

  12. The phases of meiosis There are four phases of meiosis I.

  13. The phases of Meiosis There are four phases of meiosis II.

  14. The Phases of Meiosis List the phases of meiosis in order.

  15. Why is meiosis important? • Meiosis forms sex cells with the correct haploid number of chromosomes. • Meiosis also creates genetic variation by producing haploid cells. • When haploid sex cells join together during fertilization, they make a diploid zygote, or fertilized egg.

  16. Why is meiosis important? The fertilized egg, formed when sex cells join together, divides by mitosis to create a diploid organism.

  17. How do mitosis and meiosis differ? • During mitosis and cell division, a body cell and its nucleus divide once and produce two identical cells. • The two daughter cells produced by mitosis and cell division have the same genetic information.

  18. How do mitosis and meiosis differ? • During meiosis, a reproductive cell and its nucleus divide twice and produce four cells—two pairs of identical haploid cells. • Meiosis forms sex cells used for sexual reproduction.

  19. Review • On the index card provided, answer the following exit questions. • On the back of your card, tell me: • What is one thing that you learned today? • What is one thing that you are unclear about? • How would you rate your participation today?

  20. Lesson 1 During which process does one diploid cell divide and make four haploid sex cells? A. osmosis B. fertilization C. reproduction D. meiosis

  21. Lesson 1 During which phase of meiosis I do chromosome pairs separate and pull to opposite ends of the cell? A. prophase I C. anaphase II B. metaphase I D. anaphase I

  22. Science Notebook • Summarize the lesson by comparing and contrasting the similarity and difference between mitosis and meiosis.

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