Warm Up
• Put worksheets from yesterday on desk to
be checked
Read Cell Division by Cindy Grigg (only 1
side)
Notebook Info
Table of Contents
Feb 20th
Mitosis 7.L.2.1
Notes Heading –
Feb 20th, Mitosis 7.L.2.1
What is cell division?
What happens in each step of mitosis?
Cell Cycle
Cell Cycle = The development and division
of a cell
Cell Cycle has 2 phases
1st phase = Interphase
2nd phase = Cell Division (Mitosis)
*living things grow by cell division
*cells divide to multiply
Vocabulary
DNA – genetic material that controls the
structure and function of all cells,
responsible for characteristic passed from
parent to child
Chromosomes - 2 DNA structures held
together in a string-like structure
Mitosis
the process by which a cell produces two
new identical nuclei (control center which
holds genetic material (DNA and
Chromosomes)
* Causes the number of cells to double
Daughter Cells – the two cells produced by
mitosis are called this
Mitosis has 4 Steps
Interphase > occurs just before
Mitosis begins
The cell’s DNA is copied
The chromosomes are
not visible and the DNA
appears as uncoiled
chromatin
Mitosis Interphase
Animal cell
Plant cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Step 1. Prophase
*The Nuclear membrane disappears
*Chromosomes condense and form
* Spindle fibers stretch across cell
Mitosis Prophase
Animal cell
Plant cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Step 2. Metaphase
* Chromosomes line up across the middle of
the cell and attach to spindle fibers
Mitosis Metaphase
Animal cell
Plant cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Step 3. Anaphase
* Spindle Fibers pull Chromosomes to
opposite ends of the cell (away from
middle)
Mitosis Anaphase
Animal cell
Plant cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Step 4. Telophase
*New nuclear membranes form around each
group of chromosomes
Mitosis Telophase
Animal cell
Plant cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Cytokinesis (after mitosis)
Cell pinches and cytoplasm divides
There are now 2 cells
After Mitosis:
Cytokinesis
*The actual
splitting of the
cell into two
separate
daughter cells
Beginning of cytokinesis in a plant:
Beginning of cytokinesis in an animal:
*not 2 cells until
Cytokinesis
http://www.bioweb.uncc.edu/1110Lab/notes/notes1/lab6.htm
Activities
Master Review
Division to Multiply
The Sequence of Mitosis
Exit
1. If 4 cells go through mitosis at the same
time, how many cells are there at the end?
2. Which step of Mitosis is shown in the
picture below?
How do you know?
Warm Up
1. Put HW on desk to be checked
2. Complete Mitosis half sheet
1. To create 2 new identical nuclei
Name
Is this a part of
actual mitosis?
What is happening in the cell?
(yes or no)
Interphase
No
DNA copies
Prophase
Yes
Metaphase
Yes
Nuclear membrane disappears,
Chromosomes form
Chromosomes move to middle
Anaphase
Yes
Chromosomes move to sides
Telophase
Yes
2 new nuclear membranes form
Cytokinesis
No
Cytoplasm splits, 2 cells form
Anaphase
Telophase
Metaphase
HW Answers
A.
B.
C.
D.
E.
F.
G.
Interphase
Prophase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
Mitosis happens to create 2 new nuclei, without
cells could not divide
Mastery Review
Phase > Prophase – nuclear membrane
disappears, chromosomes form
Metaphase > chromosomes in the middle of cell
Anaphase > chromosomes move to opposite sides
of cell, away from middle
Telophase > new nuclear membranes form
Division to Multiply
1. Prophase > chromosomes become
visible and nucleus disappears (pic 2)
2. Metaphase > chromomes align along
middle of cell (pic 4)
3. Anaphase > Chromosomes separate (pic
1)
4. Telophase > new nuclear membranes
form (pic 3)
Notebook
Table of Contents
Feb 21,
Mitosis Continued
Notes
Feb 21st, Mitosis Continued
What happens in a cell in each step of
mitosis?
Interphase
Cytokinesis
Interphase > occurs just before
Mitosis begins
The cell’s DNA is copied
The chromosomes are
not visible and the DNA
appears as uncoiled
chromatin
Step 1. Prophase
*The Nuclear membrane disappears
*Chromosomes condense and form
* Spindle fibers stretch across cell
Step 2. Metaphase
* Chromosomes line up across the middle of
the cell and attach to spindle fibers
Step 3. Anaphase
* Spindle Fibers pull Chromosomes to
opposite ends of the cell (away from
middle)
Step 4. Telophase
*New nuclear membranes form around each
group of chromosomes.
Cytokinesis (after mitosis)
Cell pinches and cytoplasm divides
There are now 2 cells
Interphase > before mitosis, DNA replicates
Mitosis Step 1 Prophase > step 1, nuclear membrane
disappears, X’s form, spindle fibers stretch across cell
Mitosis Step 2 Metaphase > chromosomes move to middle
and attach to spindle fibers
Mitosis Step 3 Anaphase > Spindle fibers pull
chromosomes to ends of cell
Mitosis Step 4Telophase > New nuclear membranes form
Cytokinesis > cytoplasm divides, 2 daughter cells form
What is it?
What is it?
Reinforcing Activities
1.
2.
3.
4.
Mitosis Article
Mitosis: What do you
know?
Onion Cell Mitosis
The Cell Cycle
Worksheet
1.
2.
3.
4.
Guidelines
Work independently
Use notes and textbook
82 – 83c
Read all directions and
try before asking for
help
When finished with front
and back of a handout
raise your hand to have
it checked
Exit
1. What step is shown in the picture below?
2. Why does mitosis occur?
Warm Up (put HW on desk)
In the notes section of your notebook copy the
following sentences and fill in the blanks (you
will do the heading for that page later)
1. Mitosis occurs to create ______ _________.
2. During Prophase the _________ __________
disappears and _______________ condense.
3. Two cells are formed during ______________
which is not a part of mitosis.
Warm Up
1. Mitosis occurs to create TWO NUCLEI.
2. During Prophase the NUCLEAR MEMBRANE
disappears and CHROMOSOMES condense.
3. Two cells are formed during CYTOKINESIS,
which is not a part of Mitosis.
Notebook
Table of Contents
Feb 22
Mitosis Day 3
Notes Page
Feb 22, Mitosis Day 3
What does a cell look like during each step
of mitosis?
CFA 5 Return
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
C
B
D
B
A
C
D
B
B
A
11. C
12. D
13. A
14. B
15. C
16. C
17. D
18. D
19. A
20. B
21. The thymus because it controls the
Production of white Blood cells
which fight infection
22. The cerebrum because that is the part
Of the brain that controls memory
23. They are called chemical messengers
Because they are made in one place but
travel to another to function.
24. In the endocrine system the pancreas
Makes insulin. In the digestive system the
Pancreas makes digestive juices.
25. The excretory system cleans blood,
Taking all the chemicals out that could
make you sick
26. Cerebrum
27. Cerebellum
28. Brain Stem
29. Kidneys
30. Ureter
31. Bladder
32. Urethra
33. Axon
34. Cell Body
35. Dendrite
Today’s Agenda
1. Finish HW if not done last night
2. Mitosis Poster (using Sneakerdog worksheet)
3. Mitosis Worksheet (extra credit)
4. Quiz (last 15 min of class)