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Discussion includes proportions, estimating phase and full-cycle lengths, and interpreting cell counts across 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are students expected to learn about mitosis in this activity?","Question",{"text":63,"@type":64},"Students identify major changes during each phase of mitosis, correlate those changes to the time spent in each phase, and use observations from onion root tip samples to estimate phase durations.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How do students use the onion root tip sample to estimate cell-cycle timing?",{"text":68,"@type":64},"They count the number of cells observed in each phase, then estimate how much time a cell spends in each phase based on the relative counts.",{"name":70,"@type":61,"acceptedAnswer":71},"How are the phase durations for kidney and skin cells determined in the questions?",{"text":72,"@type":64},"Students use proportions derived from the number of cells in each mitotic phase and the given mitosis duration (e.g., 24 hours) to estimate interphase length and the duration of prophase, metaphase, anaphase, and 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mitosis.  \n􀁸 Students will correlate these changes to the duration of time cells spend in each phase.  \n􀁸 While looking at a section of an onion root tip, students will count the number of cells observed in each phase of the cell cycle. They will then estimate the amount of time that a cell spends in each of the phases of the cell cycle.  \n􀁸 Students will watch a simulation of the process of mitosis and answer accompanying questions.  \nVocabulary  \n●  \n●  \n●  \nanaphase cell cycle chromosomes  \n●  \n●  \n●  \ninterphase metaphase mitosis  \n●  \n●  \n●  \nnucleus prophase telophase  \nAbout the Lesson  \n􀁸 In this lesson students investigate the cell cycle, which includes interphase and mitosis.  \n􀁸 Students will:  \n􀁸 Identify the major changes that occur in a cell during each phase of mitosis by watching a simulation.  \n􀁸 Correlate the time a cell spends in each phase with the number of cells in a rapidly dividing region of an onion root tip undergoing each phase.  \n􀁸 Understand the implications of the differences between cells that have long or short cell cycles.  \nTI-Nspire™ Navigator™  \n􀁸 Send out the The_Cell_Cycle.tns file.  \n􀁸 Monitor student progress using Class Capture.  \n􀁸 Use Live Presenter to spotlight student answers.  \nActivity Materials  \n􀁸 Compatible TI Technologies:  TI-Nspire™ CX Handhelds,  \n TI-Nspire™ Apps for iPad®,  TI-Nspire™ Software  \nTech Tips:  \n􀁸 This activity includes class captures taken from the TINspire CX handheld. It is also appropriate for use with the TI-Nspire family of products including TI-Nspire software and TI-Nspire App. Slight variations to these directions may be required if using other technologies besides the handheld.  \n􀁸 Watch for additional Tech Tips throughout the activity for the specific technology you are using.  \n􀁸 Access free tutorials at  \n[http://education.ti.com/](http://education.ti.com/)[ ](http://education.ti.com/)[calculators/pd/US/Online-](calculators/pd/US/Online-)[Learning/Tutorials](Learning/Tutorials)  \nLesson Files:  \nStudent Activity  \n􀁸 The_Cell_Cycle_Student.doc  \n􀁸 The_Cell_Cycle_Student.pdf  \nTI-Nspire document 􀁸 The_Cell_Cycle.tns  \nDiscussion Points and Possible Answers  \nAllow students to read the background information stated on their activity sheet and then in the .tns file on pages 1.2 and 1.3.  \nMove to pages 1.4 and 1.5.  \nHave students answer questions 1-10 on their activity sheet.  \n1. When the students analyze the pie charts of the cell cycles of kidney and skin cells, remind them that the mitosis portion of the cell cycle generally lasts for the same amount of time for each type of cell.  \nThe variation in the lengths of the cell cycle occurs in the interphase. For example, some cells may have a cell-cycle duration of 48 hours, half of which is in interphase and half is in mitosis.  \nLiver cells, on the other hand, may divide only once a year, eventhough the mitosis portion may last only 24 hours, just as with a skin cell. Students should use proportions to answer the following questions.  \niPad Tip: To see the number of cells in the sample that are in a particular phase, students can tap on each phase in the pie chart.  \nQ1 . Select each phase in the Kidney Cell Cycle pie chart. You will see the number of cells in the sample that are in each of the different phases. Record the number of cells in each phase in the table that follows. Add the number of cells in prophase, metaphase, anaphase, and telophase to find the total number of cells in mitosis. Then do the same for the Skin Cell Cycle pie chart.  \nAnswers:  \n\n| Phase | Kidney | Skin |\n| --- | --- | --- |\n| Prophase | 10 | 10 |\n| Metaphase | 6 | 6 |\n| Anaphase | 4 | 4 |\n| Telophase | 5 | 5 |\n| Total in Mitosis | 25 | 25 |\n| Interphase | 225 | 35 |\n\nQ2 . Suppose the mitosis portion of the cell cycle lasts for 24 hours in both kidney cells and skin cells. Estimate how long interphase lasts in each cell ","cbCaipbeFQ37SbEz","https://ap.wps.com/l/cbCaipbeFQ37SbEz","pdf",355733,"English","# Science Objectives\n## Vocabulary\n## About the Lesson\n## TI-Nspire Navigator\n## Activity Materials\n## Discussion Points and Possible Answers\n## Sample Questions (Q1–Q9)","[{\"question\":\"What are students expected to learn about mitosis in this activity?\",\"answer\":\"Students identify major changes during each phase of mitosis, correlate those changes to the time spent in each phase, and use observations from onion root tip samples to estimate phase durations.\"},{\"question\":\"How do students use the onion root tip sample to estimate cell-cycle timing?\",\"answer\":\"They count the number of cells observed in each phase, then estimate how much time a cell spends in each phase based on the relative counts.\"},{\"question\":\"How are the phase durations for kidney and skin cells determined in the questions?\",\"answer\":\"Students use proportions derived from the number of cells in each mitotic phase and the given mitosis duration (e.g., 24 hours) to estimate interphase length and the duration of prophase, metaphase, anaphase, and telophase.\"}]","The Cell Cycle - Activity Lesson | PDF",1790597520]