# A question on Mitosis watch

1. In mitosis,
a student counted the number of cells she observed in each stage on mitosis. Of 200 cells she counted, only 6 were in anaphase.
One cell cycle of onion root tissue takes 16 hours. Calculate how many minutes these cells spend in anaphase????
2. This is how I would do the question. Note: may be wrong!

If 6 out of 200 of the cells were in anaphase when counted we express this as a fraction and get a percentage of cells in anaphase. 6/200 = 0.03%

Next, you know the cell cycle takes 16 hours. Convert this into minutes. 16 x 60 = 960 minutes.

0.03 x 960 = 28.8 cells in anaphase.

However, you may have to round up to 29 to get the mark because you don't get 0.8 of a cell. Hope that helps.
3. (Original post by jsg9)
This is how I would do the question. Note: may be wrong!

If 6 out of 200 of the cells were in anaphase when counted we express this as a fraction and get a percentage of cells in anaphase. 6/200 = 0.03%

Next, you know the cell cycle takes 16 hours. Convert this into minutes. 16 x 60 = 960 minutes.

0.03 x 960 = 28.8 cells in anaphase.

However, you may have to round up to 29 to get the mark because you don't get 0.8 of a cell. Hope that helps.
This is definitely right
28.8/29

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