A student observes some onion root cells under the microscope. He notices that 9 of the cells are in telophase, 8 are in metaphase, 11 are in anaphase, 15 are in interphase, and 10 are in prophase. There are another 21 cells that are not undergoing mitosis. Calculate the mitotic index for the cells that the student is observing.
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There are 38 cells in mitosis (9+8+11+10) and a total of 74 cells visible (38+15+21). 38 divided by 74 gives a mitotic index of 0.51 (or 51%).
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