BIOLOGY FORM 4
CHAPTER 5
CELL
DIVISION
CELL DIVISION
Concept map
CELL DIVISION
Comprises of
Mitosis
Meiosis
Subdivides into
Consist of
Controlled mitosis
Uncontrolled mitosis
meiosis I
Lead to
Cloning
(asexual reproduction,
regeneration, healing)
Lead to
cancer
Occur in
Cause by
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Advantages and
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disadvantages of cloning
meiosis II
Testis, ovary and anther
Lead to
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MITOSIS / MEIOSIS
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Objectives
Students should be able to:
Identify and describe the stages of the cell cycle
Identify, using prepared slides, the phases of plant and
animal mitosis.
Describe the phases of mitosis
Describe the events of karyokinesis and cytokinesis
Identify and describe the phases of meiosis
Compare and contrast mitosis with meiosis
Describe spermatogenesis and oogenesis
Mitosis
• Mitosis is a division of the nucleus to produce
two new daughter cells containing
chromosomes identical to the parent cell.
Significance of mitosis
• Growth- allows a zygote to produce more cell
in order to grow
• Repair and replacement- allow the multicellular
organism maintain its tissues, example skin
cells and blood
• Asexual reproduction- clone
Phases in the cell cycle
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a.
b.
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The cell cycle divided into two major phases
Interphase
Mitosis
Interphase is the period between division,
divided into 3 sub phases (G1, S and G2)
a. G1- cells grow rapidly and new organelle are
synthesis
b. S- synthesis of DNA and chromosomes are
replicated
c. G2- cells prepares for mitosis, synthesis
protein and mitotic spindle begin to form
Mitosis
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1.
2.
3.
4.
Mitosis is a continuous process and divided
into 4 main phases based on the appearance
and behavior of the chromosomes.
Prophase...