Warm Up

1
Warm Up

• Put worksheets from yesterday on desk to be
  checked
• Read Cell Division by Cindy Grigg (only 1 side)

2
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?

3
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

4
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

5
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

6

• Daughter Cells the two cells produced by
  mitosis are called this

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Mitosis has 4 Steps
8
Interphase gt occurs just before Mitosis begins

• The cells DNA is copied
• The chromosomes are
• not visible and the DNA
• appears as uncoiled
• chromatin

9
Mitosis Interphase

• Animal cell

• Plant cell

Photographs from http//www.bioweb.uncc.edu/biol1
110/Stages.htm
10
Step 1. Prophase

• The Nuclear membrane disappears
• Chromosomes condense and form
• Spindle fibers stretch across cell

11
Mitosis Prophase
Animal cell
Plant cell
Photographs from http//www.bioweb.uncc.edu/biol1
110/Stages.htm
12
Step 2. Metaphase

• Chromosomes line up across the middle of the
  cell and attach to spindle fibers

13
Mitosis Metaphase

• Animal cell

• Plant cell

Photographs from http//www.bioweb.uncc.edu/biol1
110/Stages.htm
14
Step 3. Anaphase

• Spindle Fibers pull Chromosomes to opposite
  ends of the cell (away from middle)

15
Mitosis Anaphase

• Animal cell

• Plant cell

Photographs from http//www.bioweb.uncc.edu/biol1
110/Stages.htm
16
Step 4. Telophase

• New nuclear membranes form around each group of
  chromosomes

17
Mitosis Telophase

• Animal cell

• Plant cell

Photographs from http//www.bioweb.uncc.edu/biol1
110/Stages.htm
18
Cytokinesis (after mitosis)

• Cell pinches and cytoplasm divides
• There are now 2 cells

19
After Mitosis Cytokinesis

• The actual splitting of the cell into two
  separate daughter cells
• not 2 cells until Cytokinesis

• Beginning of cytokinesis in a plant

Beginning of cytokinesis in an animal
http//www.bioweb.uncc.edu/1110Lab/notes/notes1/la
b6.htm
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REMEMBER!

• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase
• Cytokinesis

I Pray More At The Church
Julie Camps mitosis power point -
http//sciencespot.net/Pages/classbio.htmlAnchor-
mitosis
21
Activities

• Master Review
• Division to Multiply
• The Sequence of Mitosis

22
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?

23
Warm Up

1. Put HW on desk to be checked
2. Complete Mitosis half sheet

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1. To create 2 new identical nuclei
Name Is this a part of actual mitosis? (yes or no) What is happening in the cell?
Interphase No DNA copies
Prophase Yes Nuclear membrane disappears, Chromosomes form
Metaphase Yes Chromosomes move to middle
Anaphase Yes Chromosomes move to sides
Telophase Yes 2 new nuclear membranes form
Cytokinesis No Cytoplasm splits, 2 cells form
25
Anaphase
Telophase
Metaphase
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HW Answers

• Interphase
• Prophase
• Prophase
• Metaphase
• Anaphase
• Telophase
• Cytokinesis
• Mitosis happens to create 2 new nuclei, without
  cells could not divide

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Mastery Review

• Phase gt Prophase nuclear membrane disappears,
  chromosomes form
• Metaphase gt chromosomes in the middle of cell
• Anaphase gt chromosomes move to opposite sides of
  cell, away from middle
• Telophase gt new nuclear membranes form

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Division to Multiply

1. Prophase gt chromosomes become visible and nucleus
   disappears (pic 2)
2. Metaphase gt chromomes align along middle of cell
   (pic 4)
3. Anaphase gt Chromosomes separate (pic 1)
4. Telophase gt new nuclear membranes form (pic 3)

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Notebook

• Table of Contents
• Feb 21, Mitosis Continued
• Notes
• Feb 21st, Mitosis Continued
• What happens in a cell in each step of mitosis?

30
Cytokinesis
Interphase
31
Interphase gt occurs just before Mitosis begins

• The cells DNA is copied
• The chromosomes are
• not visible and the DNA
• appears as uncoiled
• chromatin

32
Step 1. Prophase

• The Nuclear membrane disappears
• Chromosomes condense and form
• Spindle fibers stretch across cell

33
Step 2. Metaphase

• Chromosomes line up across the middle of the
  cell and attach to spindle fibers

34
Step 3. Anaphase

• Spindle Fibers pull Chromosomes to opposite
  ends of the cell (away from middle)

35
Step 4. Telophase

• New nuclear membranes form around each group of
  chromosomes.

36
Cytokinesis (after mitosis)

• Cell pinches and cytoplasm divides
• There are now 2 cells

37

• Interphase gt before mitosis, DNA replicates
• Mitosis Step 1 Prophase gt step 1, nuclear
  membrane disappears, Xs form, spindle fibers
  stretch across cell
• Mitosis Step 2 Metaphase gt chromosomes move to
  middle and attach to spindle fibers
• Mitosis Step 3 Anaphase gt Spindle fibers pull
  chromosomes to ends of cell
• Mitosis Step 4Telophase gt New nuclear membranes
  form
• Cytokinesis gt cytoplasm divides, 2 daughter cells
  form

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What is it?

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What is it?
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Reinforcing Activities

1. Mitosis Article
2. Mitosis What do you know?
3. Onion Cell Mitosis
4. The Cell Cycle Worksheet

• 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

48
Exit

1. What step is shown in the picture below?
2. Why does mitosis occur?

49
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)
• Mitosis occurs to create ______ _________.
• During Prophase the _________ __________
  disappears and _______________ condense.
• Two cells are formed during ______________ which
  is not a part of mitosis.

50
Warm Up

• Mitosis occurs to create TWO NUCLEI.
• During Prophase the NUCLEAR MEMBRANE disappears
  and CHROMOSOMES condense.
• 3. Two cells are formed during CYTOKINESIS, which
  is not a part of Mitosis.

51
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?

52
CFA 5 Return

1. C
2. B
3. D
4. B
5. A
6. C
7. D
8. B
9. B
10. A

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

• 11. C
• 12. D
• 13. A
• 14. B
• 15. C
• 16. C
• 17. D
• 18. D
• 19. A
• 20. B

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• 26. Cerebrum
• 27. Cerebellum
• 28. Brain Stem
• 29. Kidneys
• 30. Ureter
• 31. Bladder
• 32. Urethra
• 33. Axon
• 34. Cell Body
• 35. Dendrite

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Todays 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)