teacher: ma ching man course: course for secondary school teachers on teaching science education kla...
TRANSCRIPT
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Teacher: Ma Ching ManCourse: Course for secondary school teachers on
teaching science education KLA in the English mediumCourse date: 16/6/2014-20/6/2014
Teaching plan: (Biology) Mitotic cell divisionTarget 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
G1
• new organelles made, e.g.:
– mitochondria
– chloroplasts
• proteins made
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synthesis phase
Cell cycle
S• DNA replicates
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G2
• 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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ABCD
EF
GHI
JOnion root tip (L.S.)