Download Biology Cell Division Homework Packet #1

Biology Cell Division Homework Packet #1
Name
Hour
DUE:
HW #1
Mitosis
Lab
Questions
Diagram
HW #2
Time for
Mitosis Lab
Analysis
Graph
________
Questions
________
HW #3
Cell Division
Read Chapter 7.1
________
________
________
_______ / 5 possible points
Biology Homework #3: Cell Division
Label the following diagram with the following terms: chromosome,
chromatid, centromere. Also, add spindle fibers to the drawing on the left.
1.
Centromere
Chromosome
2.
Chromatid
Chromatid
At what stage of mitosis does this step happen?
This step happens during anaphase.
3.
Cell division is extremely important to an organism. If cell division doesn’t work
properly, there can be severe consequences.
A.
What is the cell cycle?
Cycle of cell growth and division involving interphase,
prophase, metaphase, anaphase, and telophase
B.
What is meant by “checkpoints”?
Checkpoints are places within the cell cycle in which the cell
“checks” that the cycle is proceeding properly.
C.
What can happen if the cell ignores these checkpoints?
If the cell ignores these checkpoints, cancer may occur.
Mitosis is the process in which a cell duplicates its chromosomes to generate two
identical cells. It is generally followed by cytokinesis which divides the cytoplasm
and cell membrane. This results in two identical cells with an equal distribution of
organelles and other cellular components.
4.
Using one body cell with four chromosomes, draw the products of mitosis. Be
sure to include the correct number of cells with the proper number of chromosomes
in each.
Recognizing the steps of mitosis will be something that you are quizzed on
(count on it!). Label the following pictures with the correct stage of mitosis.
5.
Anaphase
Metaphase
Prophase
Interphase
Telophase
6.
During a trip to Devil’s Lake, you discover a new variety to tree frog. To
learn more about these frogs, you decide to study their skin cells. When you look
at the skin cells under a microscope, you see the following image:
A.
Based on the evidence, which stage in these tree frog skin cells takes the
longest to complete? Explain.
In these cells, anaphase takes the longest time to complete. Based
on the field of view above, there are more cells in anaphase
indicating a longer length of time needed to complete the stage.
B.
You do a little research on tree frog cell reproduction and find that their
cells can complete the cell cycle in 10 hours (600 minutes). How long does it take
for tree frog cells to complete anaphase? Show your work.
11 cells in anaphase
24 cells total
X
600
=
276 minutes in anaphase
7.
While you and your lab partner are studying for the quiz, your lab partner
comments that you don’t need to study the events that occur during interphase.
“So much happens during the other stages of mitosis, but interphase is boring –
nothing happens”, he says. Your gut reaction is to tell your lab partner that he is
crazy. Are you right? Is there more to interphase? If so, describe two events
that occur during interphase.
You are correct, there is more to interphase. During
interphase the cell does all normal functions (ribosomes make
proteins, mitochondria make energy, diffusion, active transport,
etc.) The DNA in the nucleus also undergoes replication.
In addition to the above questions, type or neatly hand-write a response to the
following questions in your book – Read Chapter 7.1 first:
8.
Page 181 #2
Each daughter cell will also contain 12 chromosomes. Each cell
must have a complete set of genetic information.
9.
Page 181 #3
Most cells would be in interphase, the longest stage of the cell
cycle. Interphase is the longest stage in order to ensure proper
DNA replication and it is also the time when normal cell functions
occur.
10.
Page 194 #4
The cell cycle would stop at that point. Until DNA has been
replicated, the events of mitosis will not begin.
together to form chromosomes.
toward ends of ce
Spindle fibers attach to centromere
Lined up along center of cell.
Yes.
Nuclear membrane
Now at opposite ends of
cell; enclosed in newly formed nucle
membranes; appear as chromatin
Spindle fibers
Centromere
Two
Split at centromere into separate
sister chromatids.
They are equal
Answers will vary
Through mitosis cells are abl
produce more cells with identical genetic information.
Copied Chromosome
Centriole
Nuclear Membrane
Chromosom
Nuclear Membrane
Copied Chromosome
Chromatin
Spindle fibers
Interphase
Metaphase
Prophase
Nuclear Membrane
Chromatin
Centromere
Nuclear Membrane
Pinching in of
Cell membrane
Anaphase
Telophase
Interphase