BELL RINGER DIRECTIONS
1. Make sure you each have:
1.
2.
3.
4.
One whiteboard
One whiteboard marker
One whiteboard eraser
One calculator
2. Answer all projected questions on your
whiteboards and HIDE YOUR ANSWERS FROM
YOUR FRIENDS UNTIL TOLD TO HOLD THEM UP.
3. Leave answers on the whiteboard until told to
erase them.
ANSWER: INTERPHASE
NOW list 2 major
events that happen
during interphase on
your whiteboards.
Josef Reischig (author), CC BY SA 3.0,
http://commons.wikimedia.org/wiki/File:Mitosis_(261_10)_Pressed;
_root_meristem_of_Vicia_faba_(cells_in_anaphase,_prophase).jpg
In what stage of the
cell cycle is this cell?
Interphase Review
Creative Commons Attribution-Share Alike 2.5 Generic license,
http://commons.wikimedia.org/wiki/File:Schinterphase.jpg
• Interphase is separated
into 3 phases: G1, S, G2.
• Cell grows and develops
during G1 and G2.
• Cell performs its
designated function
throughout
• DNA replicates to
prepare for division
during S.
Josef Reischig (author), CC BY SA 3.0,
http://commons.wikimedia.org/wiki/File:Mitosis_(261_03)_Pressed;_root_meristem_of_Vicia_faba_(cells_in_prophase,_metaphase).jpg
ANSWER: PROPHASE
In what stage of the
cell cycle is this cell?
NOW list 2 major events that happen during
prophase on your whiteboards.
Prophase Review
• The chromatin
condenses into visible
chromosomes.
• The nuclear envelope
disappears.
• Spindle fibers begin to
form from the
centrioles.
Creative Commons Attribution-Share Alike 2.5 Generic license,
http://commons.wikimedia.org/wiki/File:Schprophase.jpg
ANSWER: METAPHASE
NOW list 1 major events
that happen during
metaphase on your
whiteboards.
In what stage of the
cell cycle is this cell?
Josef Reischig (author), CC BY SA 3.0,
http://commons.wikimedia.org/wiki/File:Mitosis_(261_13)_Pressed;_root_meristem_of_onion_(cells_in_prophase,_metaphase,_anaphase,_telophase).jpg
Metaphase Review
Creative Commons Attribution 3.0 Unported license,
http://commons.wikimedia.org/wiki/File:Metaphase.svg
• Chromosomes align
themselves in the
center of the cell along
the metaphase plate.
• The spindle fibers are
now attached to the
centrioles of the
chromosomes.
ANSWER: ANAPHASE
In what stage of the
cell cycle is this cell?
NOW list 1 major events
that happen during
anaphase on your
whiteboards.
Josef Reischig (author), CC BY SA 3.0,
http://commons.wikimedia.org/wiki/File:Mitosis_(261_10)_Pressed;_root_meristem_of_Vicia_faba_(cells_in_anaphase,_prophase).jpg
Anaphase Review
• The sister chromatids
separate and begin
moving to opposite
poles of the cell.
• The spindle fibers
shorten, pulling the
chromosomes apart.
Creative Commons Attribution-Share Alike 2.5 Generic license,
http://commons.wikimedia.org/wiki/File:Schanaphase.png
Josef Reischig (author), CC BY SA 3.0, http://commons.wikimedia.org/wiki/File:Meiosis_(261_34).jpg
ANSWER: TELOPHASE
In what stage of the
cell cycle is this cell?
NOW list 2 major events
that happen during
telophase on your
whiteboards.
Telophase Review
This image is in the public domain because its copyright has expired. From
Grey’s Anatomy, http://commons.wikimedia.org/wiki/File:Telophase.jpg
• Chromosomes begin to
“uncoil” back into
chromatin.
• The nuclear envelopes
begin to form again.
• A cleavage furrow
(animal cells) or cell
plate (plant cells) begin
to form between the 2
new nuclei.
ANSWER: CYTOKINESIS
NOW list 2 major events
that happen during
cytokinesis on your
whiteboards.
In what stage of the
cell cycle are these
cells?
Josef Reischig (author), CC BY SA 3.0,
http://commons.wikimedia.org/wiki/File:Mitosis_(261_10)_Pressed;_root_meristem_of_Vicia_faba_(cells_in_anaphase,_prophase).jpg
Cytokinesis Review
This work has been released to the public domain by its author,
LadyofHats,
http://commons.wikimedia.org/wiki/File:Mitotic_Cytokinesis.svg.
• Division of the
cytoplasm
• The cleavage furrow
pinches in all the way
forming two distinct
cells in animal cells.
• In plant cells, the cell
plate fully forms
separating the two new
cells.
Percentage Practice
Miss G has a bag that contains 100 beads. 26 of
the beads are blue, 34 of the beads are red, 18
of the beads are green, and 22 of the beads are
yellow. What percentage of the beads are
green?
ANSWER: 18% -- Pretty easy right? How how
about this…
Percentage Practice
• Miss G decided to add 163 beads to her bag
increasing her total number of beads to 263.
In this new bag there are 72 blue beads, 65
red beads, 90 green beads, and 36 yellow
beads. Now what percent of the beads are
green?
ANSWER: 34.22% (90 green beads/263 total beads)
X 100 = 34.22
Now lets look at an example using the cell cycle…
Percentage Practice
A student is observing an onion root tip under a
microscope. He counts a total of 157 cells. 20 of the
cells he counts are in anaphase. Using this data to form
a prediction, how much time does this cell spend in
anaphase? How many hours per day is the cell in
anaphase?
ANSWER: 12.74% of the time. 24 x 0.1274 =
3.06, therefore this cell spends 3.06 hours each
day in anaphase. What type of chart might you
use to visualize how much time is spent in each
stage of the cycle?
What you should see under the
microscope!
Josef Reischig (author), CC BY SA 3.0,
http://commons.wikimedia.org/wiki/File:Mitosis_(261_13)_Pressed;_root_meristem_of_onion_(cells_in_prophase,_metaphase,_anaphase,_telophase).jpg