An exciting introduction to mitosis.

1. C.N MAKAMU
201443410
TEACHING STUDIES
2017/09/18

2. INTRODUCTION TO
MITOSIS
Life sciences GRADE 10

3. What is mitosis?
• Mitosis is a form of cell division where a single cell divides into
two identical daughter cells
• Mitosis is differentiated into 5 phases which are Interphase,
prophase ,metaphase ,anaphase and telophase
• Chromosomes form when the chromatin network in the nucleus of
the cell, coil up, shortens and thickens.
• Each organism has a specific amount of chromosomes.
(Farwell)

4. Importance of mitosis
• It allows an organism to grow
• Allows the repair of damaged cells
• Reproduction in simple organisms
• Replaces dead cells and tissues
(Catherine Patterson)

5. Where does mitosis take place ?
• It takes place in all body cells(somatic cells),excluding sex cells
which is the sperm and the egg.

6. Interphase
• Cell builds up enough energy for division process
• DNA replicates
• There are no visible changes in the cell.

7. Prophase
• Nuclear envelope and nucleolus disappear.
• Chromatin become more tightly coiled, and condenses into
individual chromosomes
• Chromosomes arrange randomly in the cell.
• Centriole move to opposite poles, with spindle fibers stretching
between them.(Aneuenschwander)

8. METAPHASE
• The centrioli reached the opposite poles with the spindle fibers in
between.
• The chromosomes arrange randomly on the equator, each single
chromosome attaching to a separate spindle fiber by means of the
centromere.

9. ANAPHASE
• The spindle fibers pull tight.
• The centromeres attaching the chromatids of the chromosomes
split in half.
• Daughter chromosomes move to opposite poles.

10. Telophase
• Daughter chromosomes reach poles.
• Nuclear envelope surrounds chromosomes.
• Nucleolus reappear at each pole.
• Chromosomes become less condense forming chromatin.
• Two identical nuclei has been formed
• Invagination of the cytoplasm and plasma membrane occurs. (Cleavage
furrow forms in animal cells and a cytoplasmic plate forms in plant cells)
• Continues until the cell in divided into 2 separate cells. (Identical to one
another and to the original cell) (Kritika Choudhary)

11. references
• THESE SLIDES WERE ADAPTED FROM THE FOLLOWING SLIDES ON
SLIDE SHARE:
Farrell w (Mitosis power point)
Catherine Patterson (Cell division mitosis and meiosis)
Shimaa Sherif (Cell division and cell cycle)
Aneuenschwander (Cell cycle PowerPoint)
Kritika Choudhary (Presentation on cell cycle )