Onion mitosis phase web PDF

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Onion Mitosis Web Ws Cell Division Log on to http://www.biology.arizona.edu/cellbio/activities/cellcycle/cellcycle.html Answer the following questions 1. Why do the roots of plants grow? Because they search for water and food 2. How is it possible to see the chromosomes of a cell? Interphase with a microscope 3. For the highlighted cells, identify the phase of the cell cycle that is shown.

Interphase cytokinesis Metaphase Telophase

Click on “Next” Identify the stages of mitosis and answer the following questions. Phase: Interphase . What does the cell do during this phase? Grows and prepares for division . What happens to the DNA? Duplicates .

a. Can chromosomes easily be seen? yes b. Why? they are doubling

Phase: Prophase . What happens to the chromatin? Condenses . What marks the beginning of prometaphase? Nuclear membrane dissolves . How do chromosomes begin to move? The microtubules hase: Metaphase 7. What is the metaphase plate? Fibers line the chromosomes

Phase: Anaphase 9. What happens to the paired chromosomes? pulled to each end of the cell 10. How do the chromosomes move? Include in your answer kinetochore and spindle fibers (microtubules). By being pulled by the spindle fibers that connect to the kinetochore

Phase: Telophase 11. What forms around the chromosomes? New membrane 12. What happens to the chromosomes? They start to disperse and cant be seen 13. What is the last phase of mitosis that begins at the end of this stage? Cytokinesis

of the page past the chart and click on “Next” Follow the directions by placing the phases of mitosis into one of the five categories. When finished, count the number of cells in each of the phases and fill in the chart below. Phase Interphase Prophase Metaphase Anaphase Telophase

# of cells in this phase 20 10 3 2 1

Total Number of Cells 36 36 36 36 36

Percentage (%) 56 28 8 8 2

Questions: 1. a. Which phase was the majority of the cells in? Interphase b. Why? Because it takes the longest 2. Which phase was the least amount of cells in? Telophase 3.

a. Based on your observations, which phase do you think takes the quickest? Telophase

b. Which takes the slowest? Interphase...