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Teacher: Ma Ching Man Course: Course for secondary school teachers on teaching science education KLA in the English medium Course date: 16/6/2014-20/6/2014 Teaching plan: (Biology) Mitotic cell division Target group: S4 students Mitotic cell division
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Cell growth Cell division Revision: Cell cycle
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first growth phase Cell cycle G1G1 new organelles made, e.g.: –mitochondria –chloroplasts proteins made
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synthesis phase Cell cycle S DNA replicates
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G2G2 stores of energy increase cell grows to maximum size second growth phase Cell cycle
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Cell division Mitotic cell division Meiotic cell division Cell division
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Stage 2: cytoplasmic division Two stages in mitotic cell division Stage 1: nuclear division Mitotic cell division There are 4 phases in this stage.
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1 Prophase chromosome appears as two chromatids nuclear membrane disintegrates Mitotic cell division Nuclear division (4 phases) pro - comes from proto - meaning first
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What forms do the chromosomes take? Mitotic cell division 1 Prophase
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chromosomes line up in the middle Mitotic cell division 2 Metaphase meta - means after or next
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Where are the chromosomes located? Mitotic cell division 2 Metaphase
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chromatids separate and move to opposite poles cytoplasm starts to divide Mitotic cell division 3 Anaphase ana - means again or repeated
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What happens to the chromosomes? Mitotic cell division 3 Anaphase
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nuclear membranes form Mitotic cell division chromosomes uncoil to become chromatin 4 Telophase telo - comes from telos meaning last or final
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Mitotic cell division What happens to the chromosomes? 4 Telophase
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animal cells The cell membrane constricts inwards, forming two genetically identical cells. cell membrane Cytoplasmic division Mitotic cell division
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plant cells The cell plate, which grows outwards and divides the cell. Mitotic cell division
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Class activity: “Ice-bar stick” model Task Use the sticks to demonstrate and explain the stages and phases to your classmates. Mitotic cell division
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chromatids chromosome Class activity: “Ice-bar stick” model ice-bar sticks represent
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Prophase chromosome appears as two chromatids nuclear membrane disintegrates
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chromosomes line up in the middle Metaphase
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sister chromatids separate and move to opposite poles cytoplasm starts to divide Anaphase
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chromosomes uncoil to become chromatin nuclear membranes form Telophase
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Video Task To identify the stages and phases from the video. http://www.youtube.com/watch?v=aDAw2Zg4IgE&feature=related
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cytoplasmic division nuclear division cell division prophase metaphase anaphase telophase Summary
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1.Observe the photomicrograph of cells in the onion root tip. 2.Identify the stages and phases. Exercise: Examination of different stages and phases of mitotic cell division
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A B C D E F G H I J Onion root tip (L.S.)
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