Post on 05-Apr-2018
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CYTOKINESIS
Division of cytoplasm
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The process that show before is part in cell cycle. Can you
tell me what the phase of this process?
What can you observed from the animation above?
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What you have seen on this picture?
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ANIMAL CELLS
Actin filaments contract to pull a ring of cytoplasmmembrane inward
Forming a groove-cleavage furrow
Cleavage furrow pinches at the equator and deepenprogressively until the cell separates
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IN PLANT CELL
Vesicle gather at the equator
Vesicle fuse to form a cell plate
Cell plate grows outward until its edges fuse with the
plasma membrane New cell wall and plasma membrane are formed
Cellulose fibre are produced by the cell to strengthen thenew cell walls.
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Cell divide in highly controlled way-
division cell is being restricted, limited andmanaged in certain way
Controlled mechanism: Determine how often and how many times a
particular cell is allowed to divide Determine that certain cell are not allowed to
divide once they have specialized (nerve cell,muscle cell)
Ensure that DNA of dividing cell is exactly
copied, and each daughter cell receive a fullset of chromosomes
THE IMPORTANT OF CONTROLLED MITOSIS
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Cell and tissues that are lost through ageing, damaged, or disease,will stimulate cell division for purpose of healing, repair andreplacement of damage or missing cell.
Regeneration-the ability of a living organism to restore the lost ordamaged tissues
Regeneration in lower animal
Cut in half Grow and divide in specific Cell becomes specialized
Examples of Mitosis for Perpetuity of LivingThings
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Examples of regeneration in animal by mitosis
Starfish Salamander
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Regeneration in plant
Can regenerate most of body part from previous cell.
Regenerative power of plant is used in vegetativepropagation
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UNCONTROLLED MITOSIS IN LIVING THINGS
Cell divide out of control to form a mass of abnormal cell called
tumour 2 types of tumors:
Benign tumour
Abnormal cells that remain constrained at the original site
No function but interfere with the normal activity of health
cells
Inactive and harmless but sometimes it will develop intomalignant tumour
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Malignant tumor
Consist cancer cell
Cancer is a disorder of cell growth where a cell multiples due
to the uncontrolled mitosis Some cancerous cell break uncontrollably and spread to
other parts of the body.
The new secondary tumor may develop in other body tissuesand destroy neighboring tissues.
Melanomas
skin cancers
Colon cancers