# Biology Lab on Mitosis

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LabAlejandra Lopez 3rd period. LAB PROBLEM How long do onion root tip cells spend in each phase of the cell cycle? OBJECTIVE In this Biolab, you will: * Identify the phases of the cell cycle * Determine the time a cell spends in each part of the cell cycle PROCEDURES * Add the number of cells in each phase and record these numbers in the row marked total. Total the number of cells you counted. * Calculate the number of cells in each phase by dividing the number of cells in that phase by the total number of cells you counted. Express your answer as a decimal, then as a percentage. * Calculate the number of degrees in a circle graph for each phase by multiplying the fraction of time the cell spends in each phase by 360 degrees. * Make a circle graph showing the percentage of time a cell spends in each phase of the cell cycle. Label each portion of the circle with the phase it represents. | Interphase | Metaphase | Prophase | Anaphase | Telophase | # of cells | 96 | 8 | 7 | 8 | 2 | 1st field | | | | | | 2nd field | | | | | | total | 121 | 121 | 121 | 121 | 121 | Fraction of cells in this phase | 96/121 | 8/121 | 7/121 | 8/121 | 2/121 | Percentage of time cell spend in this phase | 79% | 7% | 6% | 7% | 2% | #of degrees in a circle graph for each phase | 284 | 25 | 22 | 25 | 4 | DRAWING CONCLUSIONS In which phase of the cell cycle was the cell spending most of it’s time? The least? Explain. The cell was spending most of its time in interphase, it is the first phase and takes the longest. The cell spent the least amount of time in telophase, because it is the last phase. MAKING REFERENCES Explain why a slide of stained cells can be used to estimate how much time a living cell spends in each phase? The slide has many cells when they are counted you have an estimate of how much time a cell spends in