Biology > GIZMOS > Gizmo SNC2D Student Exploration: Cell Division (All)

Gizmo SNC2D Student Exploration: Cell Division

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SNC2D Student Exploration: Cell Division Evaluation: K/U: /12 T/I: /13 TOTAL: /25 Instructions: Complete this package of questions while doing the GIZMO “Cell Division” found online at www.explorelearning.com. It is posted in our class folder for Gr. 10 Science. Follow the instructions on this worksheet as you go through the Gizmo. Complete everything in order. Vocabulary: cell division, centriole, centromere, chromatid, chromatin, chromosome, cytokinesis, DNA, interphase, mitosis Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Cells reproduce by splitting in half, a process called cell division. What do cells need to do between divisions to make sure that they don’t just get smaller and smaller? The cells need to grow. 2. The genetic information of a cell is carried in its DNA (short for deoxyribonucleic acid). What do cells need to do between divisions to make sure that a full set of DNA gets passed on to each daughter cell? Cells must make copies of their DNA in order for a full set of DNA to be passed onto each daughter cell. Gizmo Warm-up On the SIMULATION pane of the Cell Division Gizmo, check that the Cycle Length is set to 12 hours. Click Play ( ), observe until the maximum number of cells is shown, and then click Pause ( ). 1. Look at the cells. Do they all look the same? yes Cells that are in the process of dividing are said to be in mitosis or cytokinesis. Cells that are not dividing are in interphase.2. Check the Magnify box and move the cursor over the cells. /3 TI A. Of the 100 cells shown, how many are in the process of dividing? 18 cells B. Select the BAR CHART tab, and turn on Show numerical values. How many cells are in the interphase stage of their life cycle? 80 cells Based on these two observations, would you say that a cell spends most of its life cycle in interphase or in mitosis/cytokinesis? Interphase Activity A: Phases of the cell cycle Get the Gizmo ready: ● Click Reset ( ). ● Select the DESCRIPTION tab. ● Click on the right arrow once so that Interphase is shown. Question: What are the stages of the cell cycle? 1. Observe: Click Play and hold the cursor over the cell. Observe the cell as it divides several times. (This happens quickly!) What do you notice happening during this process? /2 TI The DNA is copied, chromatids appear, and the cells separate. 2. Summarize: On the DESCRIPTION pane, read about each phase in the cell cycle. In the spaces below, summarize what occurs in your own words. /12 KU Phase Summary Interphase - the cell grows - DNA is copied - new organelles form Prophase - the first stage of mitosis - chromosomes are formed from chromatin - spindle fibres are forme

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