1. Bellwork: Wed. Nov. 8, 2017
1. Can you name the mitotic stage each numbered cell?_________________
2. Now, place the stages of mitosis in the proper order__________________
___________________ is a disease where regulation of the cell cycle goes “bad” and normal cell growth and behavior is lost.
4. Cells with slight mutations normally “kill themselves” in a process called __________________  a.k.a programmed cell death.

7. b. stage to the right of it is called: 4 a.
Watch this video quiz:
BELLWORK: Thurs. Nov 9, 2017 1. 2.
3 a.
b. stage to the right of it is called:
4 a.
b. what state is this cell in? 5.

8. ? _____________ ? is the only subject in which multiplication is the same thing as division. 

9. http://www. biology. arizona

10. The G1 phase of interphase lasts the longest
The G1 phase of interphase lasts the longest. It is the stage that the cell spends most of its "life". The cell growing and metabolizing, and doing whatever “job” it does for the organism. It “sits” in G1 until there is a signal telling it it must divide again. If this is the kind of cell that doesn't divide again once it is made… it goes to the G0 (zero) phase and remains in G1 until the cell dies.

12. Prophase is the longest stage of mitosis
_________ __________ __________ __________ ___________
Prophase is the longest stage of mitosis
Your text says Metaphase is “generally the shortest phase of mitosis” p. 282, the demonstration we will do today (from the U of A hints that Telophase is the shortest)…. but numerous other sources believe Anaphase is the shortest….

13. Root tip
An area of rapid growth in an organism is often were a high percentage of cells are going through mitosis!

15. plant cell
mitosis

20. U of A Counting Mitosis

21. Interphase Prophase Metaphase Anaphase Telophase Total 20 10 3 2 1 36
number of cells 20 10 3 2 1 36
percent of cells
55.55%
27.77%
8.3%
5.56%
2.0%
100%

22. 2

23. 42 squares up
# of cells in each phase 50 25 I P M A T
phase

24. Counting Mitosis using a picture of cells in mitosis
Procedure: 
Count #’s of cells found in interphase & each stage of mitosis on picture & place the data on your chart.
Add up #’s of cells in all phases (this is your total # of cells.)
To determine the percentage of time each type of cell will spend in each stage of mitosis. Divide the number of each cell by the total number of cells and multiply by 100 to determine the percentage. Place these values on your chart.
After completing your chart, make a BAR graph of the data you have just collected.  Place (and label) the Stages of Mitosis on the “x” axis and the # of Cells (Label this too!!!)l in each phase on the “y” axis .Then answer the questions.

26. Problems….?
4. Which is the shortest stage of mitosis in length? Hint: you’ll probably have the smallest percentage of these in your data chart above.
5. What would happen to the cell and the chromosomes if the process of mitosis skipped metaphase?
6. What would happen if MITOSIS skipped cytokinesis?

27. Cell Races
Cells come in all sizes. Some red blood cells are only 8 µm in diameter. Nerve cells can reach lengths up to 1 meter. Most living cells, however, are between 2 and 200 µm in diameter.
"Why can’t organisms be one giant cell?"

28. Bromothymol Blue (BTB) is an indicator that turns from blue toward yellow in the presence of an acid (Acetic Acid-Vinegar

29. Ratio of Surface Area to Volume
Surface area = length × width × number of sides
Volume = length × width × height
Ratio = surface area / volume
If the length of the cell doubled, what would happen to the cell's surface area compared to its volume? The cell's surface area would be equal to 2 cm × 2 cm × 6 = 24 cm2. The volume would be equal to 2 cm × 2 cm × 2 cm = 8 cm3. The cell's ratio of surface area to volume would be 24 / 8, or 3 : 1.
What if the length of the cell triples? The cell's surface area now would be 3 cm × 3 cm × 6 = 54 cm2. The volume would be 3 cm × 3 cm × 3 cm = 27 cm3. The ratio of surface area to volume would be 54 / 27, or 2 : 1.
Note that the volume increases much more rapidly than the surface area, causing the ratio of surface area to volume to decrease. This decrease creates serious problems for the cell. Click on the activity at right to see how changes in the size of a cell affect surface area, volume, and ratio of surface area to volume.
A bigger ratio of surface area to volume is better for exchange! 29

30. The Contest
Draw straws to see if you design a big cell, a medium sized cell or a small cell
1. Mrs. Wilson will give you your selected size BTB cube (Bromothymol Blue agar is poisonous – do not eat)
2. Design (Cut a little off - but not too much) of the cell that maximizes volume & mass, but minimizes diffusion time.

31. RULES:
No donut-like holes through the agar cell, no poking, prodding, touching beaker containing agar cell in vinegar. Mrs. Wilson will determine when 100% diffusion takes place.

32. After you have finished cutting and designing your cell…
bring it to the front to weigh it. Remember to zero out the weigh boat on the scale!!!

33. (when blue color is gone)
Custom Designed Cell
Mass (g)
Time
min. sec.
(when blue color is gone)
Mass/Time
Team 1
Team 2
Team 3
Team 4
Team 5
Team 6
Team 7
Team 8

34. Mass (g)
Time
5.42 55
0.19
1.59
0.71 10
2.01 20
0.8 11
0.1
2.52
1.29 13
0.65
5.32
2.08 15
4.33 30
6.09 35
23.31
120
2.05 14
2.4
14.32
3.04 21
1.5
7.28 60 1
3.96 17
0.72
11.06
1.71
0.6
9.2
15.1 65
1.41 12

36. Take your call back to your table and…
Wait

37. We will put all of the cells into the vinegar at the same time!!!
Get Ready….

38. Go!

39. Meiosis I vs
Mitosis

40. We will time until blue completely disappears
We will time until blue completely disappears. Put beakers on white paper as a background.
The “cell” with no blue first wins

41. Turn to 326 - 327 Read comparing Meiosis and Mitosis:
Do the Analyzing Data minilab individually at the bottom of page 327.
Make the chart and answer the 4 questions on your own notebook paper.

42. Organism
Haploid number
Diploid number
Amoeba
N = 25
Chimpanzee
N = 24
Earthworm
N = 18
Fern
2N = 1010
Hamster
N = 22
Human
2N = 46
Onion
2N = 16

44. ____________, __________________
BELLWORK:
Bacteria reproduce by __________ _________ (this was on your worksheet from the book…Ch 10
Some reasons your body cells (somatic cells) undergo mitosis: __________,
____________,
__________________
Binary fission
growth
repair
reproduction