General Biology, Lab work sheet Mitosis and Meiosis...

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Experiment
Mitosis
Meiosis
MITOSIS AND MEIOSIS
and
Margaret Vorndam
M.S. Version 42-009400-01
LAB REPORT ASSISTANT
This document is not meant to be a substitute for a formal laboratory report. The Lab
Report Assistant is simply a summary of the experiments questions, diagrams if
needed, and data tables that should be addressed in a formal lab report. The intent is to
facilitate students writing of lab reports by providing this information in an editable file
which can be sent to an instructor.
OBSERVATIONS
Exercise 1: Mitosis in Animal and
Plant Cells
PROCEDURE
1.
Observe the prepared slide of the whitefish blastula under the
microscope.
2. Draw cells that represent the various stages of mitosis: Interphase, Prophase
Metaphase, Anaphase, and Telophase. Place your drawings here
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MITOSIS AND MEIOSIS
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3.
MITOSIS AND MEIOSIS
For each drawing, label the parts of the cells that you can identify such as the
nuclear membrane, chromosomes, cellular membrane, cytoplasm, spindle fibers
chromatids, cleavage furrow formation during Cytokinesis, and centrioles. It is
unlikely that you will find all of these structures. Why?
4. Observe the slide of the onion root tip under the microscope.
5.
Draw cells that represent the various stages of mitosis: Interphase, Prophase
Metaphase, Anaphase and Telophase. Place your drawings here
6.
Label the parts of the cells that you can identify such as the nuclear membrane
chromosomes, cellular membrane, cytoplasm, spindle fibers, chromatids, cell wall
formation region, and centrioles. It it is unlikely that you will find all of these
structures. Why?
RESULTS
For both the whitefish and the onion, what is the 2n number of chromosomes that were observed?
Hint: separate chromosomes are easiest to view and count during Prometaphase.
QUESTIONS
A. What is the purpose of mitosis?
B. What other term is commonly used in place of mitosis?
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MITOSIS AND MEIOSIS
C.
What is a
blastula?
D. What are the differences in the mitotic processes between animal and
plant cells?
E. Why might there be more mitotic division in an onion root tip than in other areas of
the plant?
F. A summary of mitosis fill in the correct answer. The nucleus in the undivided
cell has the diploid (2n) number of chromosomes, and the nuclei in the two split cells
also have
number of chromosomes. In mitosis, the chromosome number
(check the correct choice)
stays the same or
halves.
Exercise 2
Animals
Meiosis in
QUESTIONS
A. Which organ, the ovary or the testes, contained the greater number of
gametes? B. What may be a reason for this?
Exercise
Meiosis
3
Simulating
QUESTIONS
A.
What
accomplish?
does
mitosis
B.
When and where does mitosis
occur?
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MITOSIS AND MEIOSIS
C.
What does meiosis accomplish?
D.
When and where does meiosis occur?
E.
How do these two processes differ?
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MITOSIS AND MEIOSIS
F. How do Prophase in Mitosis and Prophase I in Meiosis
differ?
G. Does Meiosis occur anywhere else in the body beside within the
gonads?
H. How does meiosis confer advantages to an organism when compared to asexual
reproduction such as budding?
I.
How might crossing-over be a benefit to an
organism?
J.
How might crossing-over be detrimental to an
organism?
K. Crossing over can also occur during mitosis where chromosomes exchange
segments. Is crossing over more advantageous to organism survival if it occurs during
mitosis or meiosis? Explain.
LABORATORY SUMMARY
What have you learned from doing this
laboratory?

 

Solution ID:350773 | This paper was updated on 26-Nov-2015

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