TEACHER RESOURCES Quick Lab DATASHEET The Mitosis Flipbook Teacher Notes Students will model the gradual transitions throughout mitosis by making a flipbook (covers standards 7.1.e and 7.7.d). Students may work independently or in groups of two or four. If students have difficulty with Step 5, instruct them to place five blank cards between two of the consecutive cards from Step 3. Then, ask students to draw any features that all of the cards will have in common (e.g., shape of cell membrane, position of the dark yellow centrioles) on each of the blank cards. Finally, tell students to select one element that changes, such as a single color of chromosome, and to draw it as it changes over each card. Students should repeat this step until all changing elements have been added to the cards. MATERIALS For each group • • • • brad (2) cards, index (20) hole punch pencils, colored Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt California Life Science 88 The Cell in Action Name Class Quick Lab Date DATASHEET A The Mitosis Flipbook The process of mitosis involves four phases, but the transition from one phase to the next involves many intermediate stages. In this activity, you will illustrate and assemble a flipbook. The flipbook will show the phases and intermediate stages of mitosis. PROCEDURE 1. Get 20 index cards and a hole punch. • Punch two holes near the upper edge of the index cards. 2. Take four index cards from your stack. • On the first card, write Prophase. • On the second card, write Metaphase. • On the third card, write Anaphase. • On the fourth card, write Telophase. 3. Look at the images in Figure 4 in your text. • On the card marked Prophase, draw a diagram similar to Mitosis Phase 1 in Figure 4. • On the card marked Metaphase, draw a diagram similar to Mitosis Phase 2 in Figure 4. • On the card marked Anaphase, draw a diagram similar to Mitosis Phase 3 in Figure 4. • On the card marked Telophase, draw a diagram similar to Mitosis Phase 4 in Figure 4. 4. Use colored pencils to make each chromosome a different color. • On each card where the cell part is present, label at least one example of the chromosome, centromere, and nuclear membrane. 5. On the remaining blank index cards, draw the intermediate stages between each phase of mitosis. • Show the gradual transitions between each phase of mitosis by making small changes on each card. • For example, between prophase and metaphase, you could draw several cards showing the gradual disappearance of the nuclear membrane and the movement of paired chromatids to the equator. • Use three to five cards between each phase. 6. Put your cards in order. • Place a brad in each hole to assemble your flipbook. • Watch the phases of mitosis by flipping through your book quickly. Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt California Life Science 89 The Cell in Action Name Class Date The Mitosis Flipbook continued 7. Look at your flipbook. During what phase of mitosis does the nuclear membrane dissolve? 8. This flipbook shows the actions of chromosomes, centromeres, and the nuclear membrane during mitosis. Mitosis refers to the division of the nucleus. • When do other organelles replicate and divide? • Should you leave out of your flipbook what is happening to the rest of the cell’s organelles? Why or why not? 9. It is important for eukaryotic cells to undergo mitosis. • How do eukaryotic organisms grow and replace old, worn-out, or injured cells? • Why is mitosis important to organisms that must grow and replace cells? Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt California Life Science 90 The Cell in Action TEACHER RESOURCES Quick Lab: The Mitosis Flipbook Chapter Lab DATASHEET A 5. Chromosomes are visible in all of DATASHEET A 7. prophase 8. The other organelles replicate during interphase. It is acceptable to leave the other organelles off the flipbook because mitosis only refers to replication of the nucleus. 9. Eukaryotic organisms grow and replace old cells by making new cells. Mitosis is important to eukaryotic cells because they need copies of their genetic material to pass to the daughter cells. These new cells are needed to replace old, worn-out, or injured cells and to allow for the growth of the organism. 6. 7. 8. 9. DATASHEET B 7. prophase 8. It is acceptable to leave the other organelles off the flipbook because mitosis only refers to replication of the nucleus. The other organelles replicate during interphase. 9. Eukaryotic cells must undergo mitosis because they need copies of their genetic material to pass on to the daughter cells. These new cells are needed to replace old, worn-out, or injured cells and to allow for the growth of the organism. 10. 11. DATASHEET C 7. prophase 8. It is acceptable to leave the other 12. organelles out of the flipbook because mitosis only refers to replication of the nucleus. The other organelles replicate during interphase. 9. Eukaryotic cells must undergo mitosis because they need copies of their genetic material to pass to the daughter cells. These new cells are needed to replace old, worn-out, or injured cells and to allow for the growth of the organism. Daughter cells will not have identical genetic material if cells divide without going through mitosis. the phases of mitosis: prophase, metaphase, anaphase, and telophase. Chromosomes are not visible in interphase or cytokinesis. The chromosomes line up along the central axis of the cell. Two separate nuclei appear in telophase. The only stage of mitosis in which the nuclear membrane is visible is prophase. The nuclear membrane is visible during prophase. At metaphase, the membrane is dissolved and cannot be seen. The nuclear membrane cannot be seen during anaphase or telophase. The membrane forms around each set of chromosomes during telophase. The nuclear membrane cannot be seen during metaphase, anaphase, or telophase. The nuclear membrane is dissolved. The genetic material is still within the nucleus. However, it is found in loosely packed fibers, not in the thicker, easier-to-see chromosomes. No, if the DNA did not double, then the daughter cells would receive only half the DNA that was found in the parent cell. Each subsequent division would produce cells with one-half the genetic code of its parent. Most likely, this lineage of cells would not survive. Sample answer: The cell cycle begins with one cell that has a certain number of chromosomes and organelles. The cell goes through the process of cell division and ends up as two cells that are identical to the first. Each of these cells can now start the process over again. Besides mitosis, the stages of the cell cycle are interphase and cytokinesis. Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt California Life Science 115 The Cell in Action