its Phases

1. Cell Division
Mitosis
By
Dr. Priti D.Diwan
Assistant Professor
Department of Zoology
J.D.Patil Sangludkar Mahavidyalay Daryapur.

2. Reas ons for Mitosis
There are three main reasons
A. growth
B. repair/healing
C. as exualreproduction

3. Cell Division by mitosis
 S ome cells divide
cons tantly: cells in the
embryo, skin cells,gut
lining cells ,etc.
Epithelial Cell Intestinal Cell
7 week old
embryo

4. Cell Division
 Other cells divide rarely or
never.
Brain Cell – Nerve cell
Spinal Cord Cell-
Nerve cell
Cardiac Cell
(Heart Mus cle)

5. Cell Division
 2 kinds of cell divis ion:
 1. Mitosis: division of somatic cells
 2. Meios is: creation of new sex cells
Sperm cells Human egg
cell
Pancreatic
cells

6. Cell Divis ionVocabulary
 S omatic cell – a body cell; a cell whos e
genes will not be pas s ed on to future
generations.
 Germ cell - a cell that is des tined to
become a gamete (egg or sperm); a cell
whos e genes can be pas s ed on to
future generations

7. Cell Divis ionVocabulary
 diploid (2N) – a cell with 2 chromos ome
s ets in each of its cells ;all body
(s omatic)cells
 haploid (N) – a cell with 1 chromos ome
s et in each of its cells ;all gametes
(sperm, eggs )

8. Characteris tics of
Mitosis
 Adiploidcellwillgiverisetoadiploidcell
 Chromosomenumberremainsthesame
 TheDNAremainsidenticallythesame
 Onecell(2N)givesrisetotwocells(2N)

9. Cell Cycle
 A typical cell goes
through a process
of growth,
development, and
reproduction called
the cell cycle.
 Most of the cycle is
called interphase.
INTERPHASE

10. Cell Cycle
 The longes t
phas e inthe
cell cycle is
interphase.
 The 3 s tages of
interphas e are
called G 1,S ,
and G2.

12. Cell Division
 All living cells come from other living
cells.
 During mitos is ,the nucleus of thecell
divides ,forming two nuclei with
identical genetic information.

13. Mitosis
 Mitos is produces
two genetically
identical cells.
 Mitos is is referred
to in the following
stages: prophase,
metaphas e,
anaphas e,and
telophase.

14. Prophase
 In prophas e,the cell begins the proces s of
division.
 The chromos omes condense.

15. chromatin
duplicated
chromosom
e

16. Prophase
 Nuclear envelope disappears.

17. Prophase
 Centrioles
migrate to
oppos ite poles of
the cell.
 As ters and
s pindlefibers
form.
Aster and the mitotic apparatus
in an animal cell

18. Draw Prophase

19. Prophase
Aster
Sister
chromatids
Centromere
Centriole
Spindle fibers

20. Metaphase
 The
chromosomes
line up at the
equator of the cell
(metaphase plate),
with the centrioles
at oppos ite ends
and the s pindle
fibers attached to
the centromeres . Centriole
Centriole
Spindle
fibers Metaphase
plate

22. Draw Metaphase

23. Anaphas e
 In anaphas e,the
centromeres divide.
 At this point, each
chromos ome goes
from having 2 sister
chromatids to being
2 separate
chromos omes

24. Anaphas e
 The s pindle fibers
contract and the
chromos omes are
pulled to oppos ite
poles.

25. Draw Anaphas e

26. Telophase
 In telophas e the
nucleus actually
divides.
 The chromos omes are
at the poles of the cell.
 The nuclear envelope
re-forms around the
two s ets of
chromos omes.

27. Draw Telophase

28. Cytokinesis
 The division of the
cytoplasm.
 In animal cells , a
Cleavage Furrow
forms and
s eparates Daughter
Cells
C leavage furrow in adividing frog cell.

29. Cytokinesis
 In plant cells ,a CellPlate
forms and s eparates
Daughter Cells.
Cell Plate forming

30. ANIMAL VS .PLANT MITOS IS
 ANIMAL CELL
 Centriole and
aster present
 Daughter cells
s eparatedby
cleavage furrow
 PLANT CE LL
 No visible
centriole or
aster
 Daughter cells
s eparated by
cell plate

31. Mitosis:Canyounamethestages?
1
2
3
4
5

32. Mitosis:Canyounamethestages?
Prophas e
2
3
4
5

33. Mitosis:Canyounamethestages?
Prophas e
Metaphase
3
4
5

34. Mitosis:Canyounamethestages?
Prophas e
Metaphase
Anaphase
4
5

35. Mitosis:Canyounamethestages?
Prophas e
Metaphase
Anaphase
Telophas e
5

36. Mitosis:Canyounamethestages?
Prophas e
Metaphase
Anaphase
Telophas e
Cytokinesis

37.  Phasesofcellcycle-IPMA
TC
Interphase
Cytokinesis

38.  Phas es of cell cycle -IPMATC
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