Mitosis

1. RHIZZA ELAINE CATUNGA SUCLATAN, LPT
BSE – BIOLOGICAL SCIENCES

2. Objectives:
•Define mitosis;
•Identify and differentiate the
stages of mitosis; and
•Know the importance of mitosis

3. Why Do Cells Divide?
•For growth, repair, and
reproduction

4.  is a method of cell division in
which a cell divides and
produces identical copies of
itself.
Mitosis
Source: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQb3ZaW-Nz63u7LYt6OdM8cRXoFDGZahD6xTp9QZ3VyLnRAZ3vh

5. Terminology
•Chromatin - thin fibrous form of
DNA and proteins
•Sister chromatids- identical
structures that result from
chromosome replication,
formed during S phase.

6. Anatomy of a Chromosome
• Centromere - point
where sister
chromatids are joined
together
• P=short arm; upward
• Q=long arm;
downward
• Telomere-tips of
chromosome
p -arm
centromere
q-arm
telomere
chromatids

7. Interphase
•Occurs between divisions
•Longest part of cycle
•3 stages

8. Source: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTi0MZPjaKPgGw80nzfGeGQDg19A-yBNWGjj5B0D-bagFK1awOYOg

9. •Mitosis begins after G 2 and ends
before G 1

11. Source: https://www2.estrellamountain.edu/faculty/farabee/biobk/mitosis1.gif

12. Prophase
•Chromosome
condense
•Microtubules form
•The nuclear
envelope breaks
down

13. Metaphase
•Chromosomes
are pulled to
center of cell
•Line up along
“metaphase
plate”

15. Anaphase
•Centromeres divide
•Spindle fibers pull
one set of
chromosomes to
each pole

17. Telophase
•Nuclear envelope
form around
chromosomes
•Chromosomes
uncoil
•Cytokinesis

18.  elongates and the cell plate
forms (future cell wall and
cell membrane)
 pinching of plasma
membrane
Source: https://www.google.com.ph/search?newwindow=1&biw=1708&bih=771&tbm=isch&sa=1&ei=zalRWqLrK4Kd8QXg-rewCA&q=cytokenisis+in+olant+and+animal+cell&oq=cytokenisis+in+olant+and+animal+cell&gs_l=psy-
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19. Cell Division vs. Nuclear Division
Cytokinesis
The actual
division of the
cell into two new
cells.
Mitosis
The division of the
nucleus of the cell
into two new
nuclei.

20. Stages of Mitosis What happens during this stage?
Do this!
Instruction: Identify and differentiate the
stages of mitosis by supplying the
correct information on the table below.