Download Onion Mitosis Worksheet

Mrs. Keadle JH Science
Name__________________________________ period _____
date assigned_____________ date due ______________ date returned _____________
Onion Cell Mitosis Lab
As you look at the picture of the onion root cell, pick out 5 cells that look different from each
other. Draw the five different cells in the boxes below:
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6. Using the image on page 3 of the lab instructions, write down which phase of mitosis each
cell is in.
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Onion Cell Mitosis
Mrs. Keadle JH Science
7. Use the data table to record the number of cells that you see in each of the stages in the full
size image on page 3.
Analysis & Conclusions:
8. What stage were the majority of the cells in? ______________________________________
9. What percentage of the cells were in each stage? Create a ratio. #of cells in that stage = _x_
total # of cells looked at 100
Interphase
Prophase
Metaphase
Anaphase
Telophase
10. What evidence shows that mitosis is a continuous process, not a series of separate
events?_____________________________________________________________________
___________________________________________________________________________
11. The onion plant began as a single cell. That cell had X number of chromosomes. (The
exact number does not matter, we will just call that number “X”.) How many chromosomes
are in each of the cells that you observed? _______________
How do you know?____________________________________________________________
___________________________________________________________________________
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Onion Cell Mitosis
Mrs. Keadle JH Science
For the following questions, you may look back through your notes, open
power points we have used or use the digital lesson. You should be able to
answer them based on what we have learned in class.
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Why does cell division take place in
unicellular organisms?
A
B
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13 Which of these statements most
likely describes what happens if DNA
is not duplicated during interphase?
For the organism to grow.
To reproduce and pass on
genetic information.
C
To enable the organisms to
heal injured tissues.
D
to make specialized cells for
different functions.
F
The new cells would be more
numerous.
G
The new cells would have too
many chromosomes.
H
The new cells would have too
many or too few nuclei.
J
The new cells would have an
incorrect number of
chromosomes.
Allia uses a microscope to look at slides of onion cells. The slides show the
stages of the cell cycle. The slides are labeled and in the correct order, starting
with interphase. In which slide would Allia first see chromosomes?
A
anaphase
B
prophase
C
telophase
D cytokinesis
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Onion Cell Mitosis
Mrs. Keadle JH Science
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Organisms grow, repair damaged
tissues and reproduce because -
F
cells divide.
G
new DNA is created.
H
new cells live in old cells.
J
cell tissue is stored.
16
If you damage your skin, what
process do your cells use to
make repairs (scabs and new
skin)?
A
spontaneous generation
B
mitosis
C
meiosis
D
the cell theory
Which statement best describes the process of mitosis?
F
One cell splitting into numerous cells in order to maintain homeostasis
(balance).
G
One cell splits into two cells, each with half the number of chromosomes as
the original cell.
H
One cell splits into two cells, each with the same number of chromosomes as
the parent cell.
J
Two cells join together by sharing genetic material to make a complete set of
chromosomes.
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Onion Cell Mitosis
Mrs. Keadle JH Science
18
What would happen to an
organism if its cells could no
longer undergo mitosis?
A
nothing
B
it would grow larger
C
it would stop growing and die
D it would shrink
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20 After mitosis is complete, how
are the two cells alike?
A
they both have double the
chromosomes
B
they are identical copies of
each other
C
the new cell has half the DNA
D
one cell is newer than the
other
In which phase of the cell cycle
do cells spend 95% of their
time?
F
metaphase
G
anaphase
H
interphase
J
prophase
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Onion Cell Mitosis
Mrs. Keadle JH Science
21
Beginning with interphase, what are the phases of mitosis in order?
F
telophase, anaphase, metaphase, prophase
G
anaphase, metaphase, prophase, telophase
H
prophase, anaphase, metaphase, telophase
J
prophase, metaphase, anaphase, telophase
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Onion Cell Mitosis
Mrs. Keadle JH Science
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During mitosis, DNA is copied and passed on to new cells. In which part of
the cell is this hereditary material located?
A
cell membrane
B
cytoplasm
C
nucleus
D
cell wall
During which phase of mitosis do the two separate nuclei appear?
F
telophase
G
anaphase
H
early prophase
J
late prophase
Based on the process shown in the diagram above, which of the following
is a valid conclusion?
A
First the cells divide, then mitosis occurs, and then the chromosomes
are copied.
B
First mitosis occurs, then the cells divide, and then mitosis occurs
again.
First the chromosomes are copied, then endocytosis occurs, and then
the cells divide.
C
D
First the chromosomes are copied, then mitosis occurs, and then the
cells divide.
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Onion Cell Mitosis