For this assignment you will write a formal laboratory report about how long eac

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For this assignment you will write a formal laboratory report about how long each phase of mitosis takes in an onion cell.
Mitosis lasts for about 90 minutes in onion root tip cells. Each of the four phases takes a different amount of time.
Question: How long does each phase of mitosis take in an onion cell?
The phase lasting the longest will be the most commonly observed. Why do you think this is so?
Directions:
From your background knowledge of the phases of mitosis, state your hypothesis on which phase will take the most time and which the least time based on the events that are crucial for mitosis to occur accurately.
Hypothesis: _______________________________________________________________________________
Observe the 20 highlighted dividing onion root tip cells in the following images. Tally the frequency of occurrence of each mitotic phase in table 1.0.
Results:
Table 1.0
Determining Duration of Mitotic Phases
Phase
Cells Observed (tally marks)
Total Cells Counted
% of Total
Length in Minutes
Prophase
Metaphase
Anaphase
Telophase
Total
Because frequency of occurrence is directly proportional to the length of a phase, multiply the percentage of the cells in a phase by 90 minutes, the duration of mitosis in onion cells, to obtain an estimate of the time required for that phase. Use the following calculation for each phase:
# of cells in phase 90 min. = Time in Phase
# of total cells
Enter the time values in the last column of table 1.0.
Assessment:
For this assignment you will write a formal laboratory report about the length of time each mitotic phase in an onion cell takes to complete.
You will include all sections as outlined in the previous lab reports. The content of each section is described in detail. You must also include the following information:
Lab Report Rubric – Mitosis
Possible Points
Title-Give main overview and results in title
2
Abstract (summarize all sections of report)
3
Introduction
Explain the role of mitosis in cell division.
2
State the five main stages of mitosis.
2
Describe in detail what are chromosomes doing in each stage.
4
Compare mitosis in plant & animal cells
2
State hypothesis to question above:
Estimate the relative duration of each stage & explain your reasoning
2
Methods
How did you test each hypothesis above? “To test hypothesis 1 we….., etc.”; Be sure to state how the estimated time in the phase was calculated.
3
Results
Refer to figures, graphs, and/or tables; summarize data but don’t repeat
2
Table 1.0 Determining Duration in Mitotic Phases
2
Bar Graph for Mitosis times.
4
Data-Include Average +/- std. dev.
2
Discussion
For your hypothesis state if your data SUPPORT or REFUTE your hypothesis and explain rationale why.
6
Literature Cited
2
Grammar, spelling, neatness
2
Total
40
Type up the report and hand in as an email attachment.

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