Online Onion Root Tips



Online Onion Root Tips

Determining time spent in different phases of the cell cycle

Go to watch and read the power point.

The assignment:

In this activity, you will be presented with cells from the tip of an onion root. You will classify each cell based on what phase it is in.

To find your percent use the calculator: start-programs-accessories-calculator. First enter the number of cells in that particular phase then divide by the total amount. Then move the decimal to the right two spaces or just multiply by 100. For example if there are 5 cells in Prophase take 5 divided by 36 which is .138 move the decimal to the right two spaces. Which gives you 13.8 then round to 14%.

You can enter data in this table as you go along, or at the end of the activity.

| |

| |

|Interphase |

|Prophase |

|Metaphase |

|Anaphase |

|Telophase |

|Total |

| |

|number of cells |

|[pic] |

|[pic] |

|[pic] |

|[pic] |

|[pic] |

|36 |

| |

|percent of cells |

|[pic] |

|[pic] |

|[pic] |

|[pic] |

|[pic] |

|100% |

| |

In the space below, draw an animal cell as it would appear in each of the 5 phases above. Be sure to darken chromosomes so that their position in each phase is clearly visible.

1. In what ways does mitosis differ between plant and animal cells?

2. What phase do cells spend most of their time in? Why?

3. What part of the cell cycle occurs immediately after telophase?

4. In which part of the cell cycle are DNA duplicated? (Doubled)

5. Which stage or stages were the hardest to identify? Explain.

6. Which stage or stages were the easiest to identify? Explain.

7. Why would the tip of an onion root have many cells undergoing mitosis?

8. Explain how the process of mitosis helps an organism to grow in size.

9. What is the purpose of cell division in eukaryotic cells?

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Interphase

Prophase

Metaphase

Anaphase

Telophase

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