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The Stages of Mitosis

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by

William Masse

on 3 November 2014

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Transcript of The Stages of Mitosis

Topic: MITOSIS: Cell Division

Do Now: How many new cells are made in your body each day?
Mitosis
is

the divison of a cell.
Involving the '
somatic
' or '
bodycells
' of an organism.
KEY FEATURE
1
Mitosis is responsible for
growth
and
tissue repair.

That is... If you're growing your cells are dividing through Mitosis.

If you are healing, your cells are dividing through Mitosis.
Through mitosis, two

identical

daughter cells
are always produced
KEY FEATURE
2
KEY FEATURE
3
Mitosis is a quick process which goes through
4 distinct phases.
Prophase
Metaphase
Anaphase
Telophase/Cytokinesis
KEY FEATURE
4
Since that's done with..
Lets get into the
4 different phases
involving
mitosis.
So those are the
4 key features
involving
Mitosis

Okay.. So first is first.
Mitosis
is
cell reproduction
involving
eukaryotic cells
It has
4
different
key features
lets look into them..
PHASE
0
Interphase - (Includes G1, S, G2)
This is the
state
where the
cell
spends the
majority of it's time
performing it's
usual function
including the
preparation for cell division.
DNA is not visible as chromosomes, DNA is uncoiled.
PHASE
I
Prophase
During this phase all the various cell organelles
except the
chromosomes disappear, including organelles such as the
nucleus.
Chromosomes are now visible. DNA is doubled.
nuclear membrane
and other organelles disappear
As the
centrosomes
move towards the
opposite poles,
the
spindle fibres
now attach to the chromosomes
Mitotic spindle fibres
now attached to chromosome
State of nucleus:
State of nucleus:
State of cell:
PHASE
II
Metaphase
Recall that during the S phase an extra copy of the organisms DNA is made. Also, organelles needed for division called centrosomes are created.
DNA is duplicated, but still not visible.
State of nucleus:
2 centrosomes
During this phase, as the chromosomes prepare to split,
the chromosomes
begin to
center
on the
equator (Center).
Equatorial plane
Chromosomes
now aligned in the
middle of the cell, the equatorial plane
Chromosomes now ready to split
Summary:
PHASE
III
Anaphase
Equatorial plane
During this phase, the
each chromosome splits
to form
two
pairs (now considered separate chromosomes) with the help of the
spindle fibers
and move towards the
opposite poles.
Equatorial plane
These now separate chromosomes move towards the opposite poles
New chromosomes
During this phase as the
chromosomes
reach their poles,
cell organelles
begin to
reappear
and the
division of the cytoplasm
called
cytokinesis
begins
PHASE
IV
Telophase
spindle fibres disappear as chromosomes reach poles
Cytokinesis begins
Nuclear membrane and other cell organelles reappear
chromatin begin to diffuse again
And then finally..
Cytokinesis
takes over, forming a cell membrane and dividing the cell into
two identical daughter cells
And so, the twins were born.
Hurray to mitosis!
Mitotic spindle fibres
now

begin emanating from the
centrosomes
as they start moving towards opposite poles
Spindle fibers
Spindle fibers
There are about two trillion cell divisions in your body each day.
That's about one trillion new cells each day.
Ready for Class?
Pen or Pencil
Notebook
Cell Phone Off!
Paper plate Mitosis Model
Criteria
1) Accurate
2)Complete
3)Neat
4)Labeled

5) No mess is left when you leave.
Full transcript