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Asexual Reproduction

Asexual Reproduction. Mitosis. DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?. 1. Ready?. Begin!. 4:00.

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Asexual Reproduction

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  1. Asexual Reproduction Mitosis DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals? 1

  2. Ready? Begin!

  3. 4:00 DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?

  4. 3:00 DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?

  5. 2:00 DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?

  6. 1:00 DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?

  7. TIME’s UP!

  8. Asexual Reproduction Mitosis DSQ: Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals? ANALYZE (break apart, study the pieces) There is a question within a question in this DSQ. Can you identify the question within the DSQ? 8

  9. Vocabulary Needed Chromosomes- structures in the nucleus that contain DNA DNA-deoxyribonucleic acid, is the master copy of an organism’s information code. Chromatin- hereditary material in a cell’s nucleus, it coils into the form of chromosomes when a cell divides Centromere-where the double stranded chromosome is held together

  10. How do little elephants grow up to be BIG elephants?

  11. Why do animals shed their skin?

  12. The process of asexual reproduction begins after a sperm fertilizes an egg.

  13. Three reasons why cells reproduce by asexual reproduction: 1. Growth 2. Repair 3. Replacement Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun. Cell that reproduce by asexual reproduction reproduce constantly.

  14. Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis

  15. Interphaseoccurs before mitosis begins • Chromosomes are copied (# doubles) • Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase CELL MEMBRANE Nucleus Cytoplasm

  16. Interphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  17. Prophase 1st step in Mitosis • Mitosis begins (cell begins to divide) • Centrioles(or poles) appear and begin to move to opposite end of the cell. (Only in animal cells). • Chromosomes become fully visible. • The nuclear membrane disappear • Spindle fibers form between the poles.(Only in plants). Centrioles Sister chromatids Spindle fibers

  18. Prophase Plant Cell Animal Cell Spindle fibers Centrioles Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  19. Metaphase 2nd step in Mitosis • Chromatids (or pairs of chromosomes) attach to the spindle fibers and line up across the center of the cell. Centrioles Spindle fibers

  20. Metaphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  21. Anaphase 3rdstep in Mitosis • Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell. Centrioles Spindle fibers

  22. Anaphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  23. Telophase4th step in Mitosis • Two new nuclei form. • Chromosomes appear as chromatin (threads rather than rods) and become harder to see. • Centrioles and spindle fibers start to disappear. • A nuclear membrane starts to form around each group of chromosomes. • Mitosis ends. Nuclei Nuclei Chromatin

  24. Telophase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

  25. Cytokinesisoccurs after mitosis • Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

  26. Animal Mitosis -- Review

  27. Plant Mitosis -- Review

  28. Cell Cycle

  29. - Cell Division The Cell Cycle 30

  30. MitosisAnimation http://www.cellsalive.com/mitosis.htm

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