Download BI 101 Week 6 Lab Report Questions (Mitosis and Meiosis) 1. Label

BI 101 Week 6 Lab Report Questions (Mitosis and Meiosis)
1. Label the arrows below with the appropriate stage of the cell cycle:
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A
B
C
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F
E
D
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2a. In what stage were most of the onion root tip cells in? Based on what you know about cell cycle
division, does this make sense?
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b. Were there any stages of the cell cycle that you did not observe? How can you explain this using
evidence from the cell cycle?
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3. As a cell grows, what happens to its surface area:volume ratio? (Hint: Think of a balloon being blown
up). How does this ratio change after a cell finishes dividing? Why is this important for the function of
the cell?
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4a. What is the difference between mitosis vs. cytokinesis?
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b. What would happen if mitosis were uncontrolled?
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Record your results from “Experiment 1: Observation of Mitosis in a Plant Cell” in the tables below:
Table 1: Mitosis Predictions
Predictions:
Supporting Evidence
Table 2: Mitosis Data
Number of Cells in Each Stage
Total Number of Cells
Calculated % of Time Spent in
Each Stage
Interphase:
Interphase:
Prophase:
Prophase:
Metaphase:
Metaphase:
Anaphase:
Anaphase:
Telophase:
Telophase:
Cytokinesis:
Cytokinesis:
For each of the phases listed above in “Table 2: Mitosis Data”, draw an example a cell in that phase in
the space below (you may also insert/attach a photo of your drawings done on paper):
Interphase:
Prophase:
Metaphase:
Anaphase:
Telophase:
5. Why is it important that each daughter cell produced during mitosis contain information identical to
the parent cell? What would happen if it didn’t?
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For “Experiment 2: Tracking Chromosomal DNA Movement through Mitosis”, including a drawing or
photo of your mitosis bead diagram for each of the following phases:
Prophase:
Metaphase:
Anaphase:
Telophase:
6. Suppose a person developed a mutation in a somatic cell which diminishes the performance of the
body’s natural cell cycle control proteins. This mutation resulted in cancer, but was effectively treated
with a cocktail of cancer-fighting techniques. Is it possible for this person’s future children to inherit this
cancer-causing mutation? Be specific when you explain why or why not.
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For “Experiment 3: The Importance of Cell Cycle Control”, in the space below, please list the name of
the five abnormalities your research uncovered and describe why each is considered abnormal:
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7. Compare and contrast mitosis and meiosis.
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8a. In “Experiment 1: Following Chromosomal DNA Movement through Meiosis”, how many
chromosomes were present when meiosis I started?
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b. How many nuclei are present at the end of meiosis II? How many chromosomes are in each?
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c. What is the ploidy (i.e. diploid, haploid, etc.) of the DNA at the end of meiosis I? What about at the
end of meiosis II?
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d. How are meiosis I and meiosis II different? List two reasons
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9a. Why did you use non-sister chromatids to demonstrate crossing over?
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b. What combinations of alleles could result from a crossover between BD and bd chromosomes?
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c. Why is it necessary to reduce the number of chromosomes in gametes, but not in other cells?
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10. Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would
expect to find in the following:
a. Sperm Cell: Type answer here
b. Egg Cell: Type answer here
c. Daughter Cell from Mitosis: Type answer here
d. Daughter Cell from Meiosis II: Type answer here