Mitosis Lab Ocular lens - 10X Objectives - 4X - 10X - 40X Total Magnification x 10X = 40X x 10X = 100X x 10X = 400X Diaphragm – adjusts light & heat How.

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Mitosis Lab Ocular lens - 10X Objectives - 4X - 10X - 40X Total Magnification x 10X = 40X x 10X = 100X x 10X = 400X Diaphragm – adjusts light & heat How to use the microscope 1.Turn on – crank dial to 10 2.Adjust light with diaphragm 3.Place slide in corner & release retractable arm….gently!!!!!! 4.Using scanning lens (4X), focus on sample with coarse focus 5.Change objective (if needed) 6.Repeat

Mitosis Lab

Figure 12.10

Mitosis Lab 1.If your observations had not been restricted to the area of the root tip that is actively dividing, how would your results have been different? 2.Why did we choose to use the onion root tip to study mitosis? 3.Calculate the percentage of cells in each stage. Consider that it takes (on average) 24 hours (1440 min) for onion roots tip cells to complete the cell cycle. Knowing this, you can calculate the amount of time spent in each phase of the cell cycle from the percentage of cells found in each stage of mitosis. (Recall 90% of time is spent in interphase.) % of cells in stage (decimal) X 144 min = _____ minutes in that stage ( mitotic phase ) 4.Draw an example of each stage. ProphaseMetaphaseAnaphaseTelophase = 25 cells Table 3.1