The Amazing Cells Multiplication with Assessment

1. Cell Division

2. Objectives:
1) Identify the types of cells in the body of
organism.
2) Name the sequence of stages in mitosis
and meiosis.
3) Give the significance of cell division
processes.
4) Construct model to illustrate the 5
significant stages of mitosis and meiosis.

3. Cell division is the cell’s way to
reproducing itself. Reproduction is a
life process, occurring at all levels of
biological organization, whereby
more of the same unit is formed.
Unlike protein synthesis or energy
transformation, reproduction is not
essential for the survival of the
organism.

4. Cells of the Human Body
Somatic cells are
all the cells of the
body except sex
cells.. They are the
diploid number
(2N), or complete
set of
chromosomes.
Reproductive cell
are also called
gametes, germ
cells or sex cells.
This known is the
haploid number
(N), or 23
chromosomes.

5. Direction: Identify the following pictures as
Somatic cell or Reproductive cell
Activity 1

8. Mitosis
Or cell division
is important as
it is the first
step in growth
and
differentiation.

9. * Chromosomes
(chromatin) are not
seen as distinct
structure.
* The nucleus is still
visible.
* The nuclear
membrane is still
present.
* Centrioles,
chromosomes and
DNA duplicated.
Interpha
se

10. * The chromosome
become visible and
condense.
* The nucleus and
cell membrane
disappear.
* The centriole move
to the opposite side
of the nucleus.
* The spindle fiber
begin to organize.
Prophase

11. * The nuclear
membrane has
completely
disappeared.
* The chromosome
line up at the
center of the cell
forming the
metaphase plate.
Metapha
se

12. * Sister chromatids start
to move forward towards
the poles, seemingly
being pulled by the
threads or fibers.
* Sister chromatids
separate and begin
moving toward opposite
poles of the cell.
* Slinger cleavage furrow
in the cell membranes
begins to form in the
region of the equator.
* Cytokinesis begin
Anaphas
e

13. * New nuclear
membrane starts to
form in each new cell.
* Chromosome become
longer, thinner and less
distinct.
* The nucleolus
reappear.
* Centrioles are
replicated.
* The cleavage furrow
deepens and the cells
finally divide into to
parts.
Telophas
e

14. The process of mitosis varies from one
cell to another. The process may occur in
less than half hour or longer. Some cells,
like your nerve cells, do not divide once
they have differentiated and reached
maturity. Mitosis occurs at a faster rate
at the beginning of the early
development.

15. Meiosis
Involved the reproductive
cell-the sperm and egg cells.
It is the type of cell division
that occurs into two cycles cell
division where during the
formation of an ovum
(oogenesis) and formation of
sperm (spermatogenesis)
There is a reduction of
chromosome number to the
haploid number.

16. Meiosis
1

17. * The chromosomes
begin to condense, and
the spindle of
microtubules begin to
form. The DNA has been
replicated and each
chromosomes consist of
two sister chromatids
attached at the
centromere. Homologous
chromosomes paired up
and become closely
associated during
synapsis. Crossing-over ,
forming chiasmata.
Prophase
1

18. * The pairs of
homologous
chromosomes align
along the metaphase
plate.
* A kinetochore
microtubule from
one pole of the cell
attached to one
homologous of a
chromosome.
Metapha
se 1

19. * Kinetochore
microtubules shorten,
and homologous pair
are pulled apart.
* One duplicated
homologous goes to
one pole of the c ell,
while the other
duplicated
homologous goes to
the other pole. Sister
chromatids do not
separate.
Anaphas
e 1

20. * The separated
homologous form
a cluster at each
pole of the cell,
and the nuclear
envelope reforms
around each
daughter cell
nucleus.
Cytokinesis may
occur.
Telophas
e 1

21. Meiosis
2

22. A new spindle
apparatus
form in each
cell, the
nuclear
envelop breaks
down.
Prophase
2

23. * A completed
spindle apparatus
is in place in each
cell.
* Chromosomes
consisting of sister
chromatids joined
at the centromere
aligned along the
metaphase plate in
each cell.
Metapha
se 2

24. The
centromere
split, and sister
chromatids are
pulled to
opposites poles
of the cell.
Anaphas
e 2

25. * The nuclear
membrane
reform around
four different
cluster of
chromosomes.
* After
cytokinesis, four
haploid cells
result.
Telophas
e 2

26. Activity 3
Give the
significance
of cell
division
processes

27. Prepared by:
Biazon, Sherryl S.
Gealon, Princess Aljean M.
Parcon, Jenilyn S.
Submitted to:
Mrs. Maria Lady Sol A. Suazo
Educ. 7 Instructor
Cell division : Mitosis and
Meiosis