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Asexual Reproduction Mitosis
The process in which the nucleus divides to form two new nuclei. 1
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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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Three reasons why cells reproduce by asexual reproduction: 1. Growth 2
Three reasons why cells reproduce by asexual reproduction: Growth Repair 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.
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Animated Mitosis Cycle
Interphase Prophase Metaphase Anaphase Telophase & Cytokinesis
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Paper Plate #1-Interphase occurs before mitosis begins
Gap 1 Phase – Cell grows to mature size – organelles are duplicated Synthesis (S) Phase – Chromosomes are copied Gap 2 (G2) Phase – Cell continues to grow and prepares to divide CELL MEMBRANE Nucleus Cytoplasm
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7th Period Gifted Class Only
G1 – checkpoint Is the Cell large enough? Are sufficient nutrients available? Are growth factors present? G2 checkpoint Was DNA replicated correctly? Is the cell large enough?
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Interphase Plant Cell Animal Cell
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Paper Plate #2 Prophase -1st step in Mitosis
Mitosis begins (cell begins to divide) Chromotin strands condense to form chromosomes Nuclear membrane breaks down Spindle fibers form a bridge between the two ends of the cell. Centrioles Sister chromatids Spindle fibers
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Prophase Plant Cell Animal Cell Spindle fibers Centrioles
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Paper Plate #3 Metaphase - 2nd step in Mitosis
Chromatids (or pairs of chromosomes) line up in the center of the cell and attach to the spindle fibers at the centromere. Centrioles Spindle fibers
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Metaphase Plant Cell Animal Cell
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Paper Plate #4 Anaphase - 3rd step in Mitosis
Chromatids (or pairs of chromosomes) separate at the centromere Each chromatid moves to the opposite end of the cell along a spindle fiber Centrioles Spindle fibers
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Anaphase Plant Cell Animal Cell
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Paper Plate #5 Telophase - 4th step in Mitosis
Two new nuclei form. Chromosomes appear as chromatin (threads rather than rods). Mitosis ends. Nuclei Nuclei Chromatin
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It is only the final stage that differs in plant and animals
In animal cells a ring of actin filaments forms round the equator of the cell and then tightens to form a cleavage furrow which splits the cell into two In plant cells vesicles move to the equator, line up and fuse to form two membranes called the cell plate. A new cell wall is laid down between the membranes, which fuse with the existing well wall.
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Telophase Plant Cell Animal Cell
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Paper Plate #6 Cytokinesis occurs after mitosis
Cell membrane moves inward to create two diploid daughter cells have formed– each with its own nucleus with identical chromosomes.
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Mitosis produces identical offspring
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Animal Mitosis -- Review
Interphase Prophase Metaphase Anaphase Telophase
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Plant Mitosis -- Review
Interphase Prophase Metaphase Anaphase Telophase
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Cell Cycle
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- Cell Division The Cell Cycle 24
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Cancer? Unregulated mitosis Benign Malignant/ metastasis
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Mitosis Animation
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