Cell division is the process by which cells multiply. It occurs through mitosis, where the nucleus divides, and cytokinesis, where the cytoplasm divides. The cell cycle refers to the life of a cell, which is divided into interphase and the mitotic phase. Interphase consists of G1, S, and G2 phases where the cell grows and duplicates its DNA in preparation for division. Mitosis then divides the duplicated DNA equally between two daughter cells so they have the same number and type of chromosomes as the original cell. Cell division ensures new cells are produced to replace damaged ones and allow organisms to grow in size.

1. Cell Division
Prepared by:
Joel P. Ogoc, Ed. D.
Master Teacher II
Science Department
ZNNHS

2. Refers to the process that results in the
increase in the number of cells
This happens so the body produce
new cells that replace damaged ones
Cell division that takes place on body
cells results to increase in size
Two processes occur during cell
division namely:
Division of the nucleus (Mitosis)
Division of the cytoplasm (Cytokinesis)

3. Cell Cycle
Refers to the life cycle of the cell
It is divided into two (2) stages
Interphase
Mitotic phase
Interphase refers to the period after 1
cell division and before another cell
division
It is divided into 3 substages

5. G1 or
First Gap
The period during
which the new
cells initially grows
This occurs from
the formation of
new cells until the
DNA starts to
replicate
Occurs about 4
hours

6. S or
Synthesis
The middle
stage where
the
chromosomes
duplicate in
preparation for
the next cell
division
This occurs
about 10 hours

7. G2 or
Second Gap
This falls
between S and
the next cell
division
It represents
the time of
growth in
preparation for
cell division
It occurs about
4 hours

9. During interphase, the nucleus is
surrounded by its nuclear membrane
One or more nucleoli are visible
inside the nucleus
The chromatin are very thin and
tangled; appears as an irregular mass
The DNA is stretched out thin in the
nucleus to make duplication possible
All proteins that the cell needs for its
activities during its whole life is made
during this time

10. Thus the chromatin and DNA are
doubled during interphase
Mitosis is a way of dividing the
nucleus with its replicated DNA
Resulting daughter cells have
Same number of chromosomes
Similar characteristics
It occurs for about 2 hours
Cytokinesis refers to the division of
the cytoplasm

27. Comparing Plant and Animal
Cell Mitosis
Plant cell Animal cell
Do not have centriole Centrioles also travel
Do not form asters and replicate
Spindle fiber still It forms asters for the
form spindle fiber
Daughter cells are Daughter cells are
formed by cell plate formed by a cleavage
Cell walls form from in the cell membrane
inside going out Furrows are formed
from outside goping
in

28. that’s all for
today
Study for the
check up quiz
tomorrow