Cell Division—Mitosis
Why don’t our cells just get bigger and bigger?
Answer: Our cells can’t handle that much waste
material passing through them.
Cells increase in number – Not size.
Cell Division: One cell divides into two cells –
these are identical to the parent cell.
Cell division has 6 phases.
Mitosis has 4 phases.
Phase One - Interphase
Inter means “between”
No actual dividing taking place.
Fat chromosomes become thin,
threadlike CHROMATIN.
In animal cells CENTRIOLES, or
leaders appear.
Toward end of interphase,
chromosomes duplicate.
What was 46 is now 92.
Now called sister chromatids and
are connected by a centromere.
Look at the board for an
example of interphase. Draw
and label it in your notes.
Phase Two - Prophase
Mitosis begins!
Process by which nucleus of a cell
divides into 2 nuclei and formation
of 2 new daughter cells begins.
Chromatin back to chromosomes.
Nucleolus disappears.
Centrioles begin moving.
Nuclear membrane breaks down.
Spindle forms. (Bridge)
Draw out prophase.
Phase 3 - Metaphase
Centromeres
line up in the
middle.
Then attach to
the spindle.
Phase 4 - Anaphase
Centromeres
(holding sister
chromatids together)
split.
Move apart to separate ends
of the cell.
Called chromosomes again.
ANAPHASE
Phase 5 - Telophase
Chromosomes
uncoil into thin
chromatin.
Nuclear membrane forms.
Mitosis is COMPLETE!
TELOPHASE
Phase 6 - Cytokinesis
Cytoplasm divides
Cell membrane moves
inward to
Pinch cytoplasm in two
Each cell now contains a
nucleus with
identical chromosomes.
END RESULT==
2 new daughter cells
**In plant cells-a cell plate
forms in between—this
will become the
Cell Wall
The 6 “phases” of Cell Division
M
I
T
O
S
I
S
Phase One –
Interphase
I
Phase Two –
Prophase
Painted
Phase Three – Metaphase
My
Phase Four –
Anaphase
Aunt’s
Phase Five –
Telophase
Toes
Phase Six –
Cytokinesis
Crimson!!
Now you come up with your own way!