Asexual Reproduction
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Transcript of Asexual Reproduction
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Asexual ReproductionMitosis
Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?
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How do little elephants grow up to be BIG elephants?
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Why do animals shed their skin?
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The process of asexual reproduction begins
after a sperm fertilizes an egg.
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Three reasons why cells reproduce by asexual reproduction:
1. Growth 2. Repair 3. ReplacementSkin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun.
Cell that reproduce by asexual reproduction reproduce constantly.
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Animated Mitosis Cyclehttp://www.cellsalive.com/mitosis.htm
• Interphase• Prophase• Metaphase• Anaphase• Telophase & Cytokinesis
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Interphase occurs 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 MEMBRANENucleus
Cytoplasm
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InterphaseAnimal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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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. • Spindle fibers form between the poles.
CentriolesSister chromatids
Spindle fibers
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ProphaseAnimal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Spindle fibers
Centrioles
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Metaphase 2nd step in Mitosis
• Chromatids (or pairs of chromosomes) attach to the spindle fibers.
Centrioles
Spindle fibers
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MetaphaseAnimal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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Anaphase 3rd step in Mitosis
• Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell.
Centrioles
Spindle fibers
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AnaphaseAnimal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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Telophase 4th step in Mitosis
• Two new nuclei form. • Chromosomes appear as chromatin
(threads rather than rods).• Mitosis ends.
NucleiNuclei
Chromatin
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TelophaseAnimal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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Cytokinesisoccurs after mitosis
• Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.
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Animal Mitosis -- ReviewInterphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
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Plant Mitosis -- ReviewInterphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
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Cell Cycle
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- Cell Division
The Cell Cycle
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