Search results for: “onion”
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Mitosis in an Onion Cell
Graphic shows an image of the cells in an onion root tip in various stages of mitosis.
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Investigation – Root Growth and Cell Division
Understanding plant hormones becomes much clearer for students when they connect hormone function directly to visible growth patterns, especially in roots of actively dividing tissues. In this classroom activity, students explore how auxin promotes root initiation, then view the dividing cells with a microscope. The introductory text explains how plant hormones work to stimulate root…
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Why Don’t Elephants Get Cancer? – Peto’s Paradox
Looking for an engaging, real-world way to teach genetics, cancer biology, and evolution? This student-friendly article on why elephants rarely get cancer is a ready-to-use resource that brings abstract concepts to life using a fascinating biological mystery. This lesson centers on two powerful genes, TP53 (p53) and LIF6. Students explore how gene regulation, apoptosis, and…
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Case Study – Ethan’s Journey with Leukemia
Are you looking for an engaging way to teach high school biology? Real-world connections can make a huge impact on your students’ understanding of complex topics like the human body, cell function, and diseases. That’s why we’ve created Case Study: Understanding Leukemia Through Ethan’s Story—a resource designed to bring the science of leukemia to life…
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Mitosis and Cancer – Data Analysis on Carcinogenesis
A group activity where students analyze images and charts to determine the relationship between mitosis and cancer.
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Investigation: Mitosis
This mitosis investigation was created during the 2020 pandemic for remote learning. In previous years, biology students would view slides in the lab and analyze data on cancer and mitotic index. This at-home activity only looks at the mitosis of onion cells and I plan to add cancer and mitotic index as a separate activity.…
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Mitosis Drag & Drop
If you have used the cell cycle label (mitosis) in class, this version will work for assigning on Google Classroom. The image of the cell cycle includes interphase, prophase, metaphase, anaphase and telophase, plus several structures associated with the process. Students can drag the labels to the image on Google slides and then complete a…
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Virtual Microscope
This worksheet can be used with the Virtual Microscope where students can place specimens on a stage and use coarse and fine adjustment knobs to magnify up to 100x. Generally, I have my students practice with real microscopes, starting with a basic tutorial lab where they focus on the letter “e.” This virtual lab also…
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Cell Cycle Label
This worksheet was created for freshman level biology and is a simpler version of a worksheet I use in the advanced classes showing the cell cycle. The image shows a cell in interphase, prophase, metaphase, anaphase, and telophase. Students label each phase and then identify structures within the cell that are important for cell division,…
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Cell Cycle Labeling
Students label the image of a cell undergoing mitosis and answer questions about the cell cycle.
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Investigation: Mitosis and Cancer Cells
The first part of this investigation, students examine slides of mitosis in an onion root tip and count the number of cells in each phase of the cell cycle. An equation is then used to estimate the percentage of time the cell spends in each phase and students create a bar graph to display results. …
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Mitosis – Internet Exploration
This assignment can be a stand-alone activity to help students learn to identify the phases of mitosis by viewing various animations. There are several sites to visit, where students perform tasks, such as labeling and making comparisons. Site 1: Bioman Mitosis Mover This is a game site where you progress through levels. Students can print…
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Investigation: Comparing Plant and Animal Cells
This simple investigation asks students to view cells under the microscope and compare differences between plant and animal cells. Students are instructed in the procedure for removing the epithelial cells of an onion and staining with iodine. These cells are fairly easy to see and most beginning students will have no trouble locating the…
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Investigation: What Are the Different Types of Cells?
Students look at cells from different domains and kingdoms; compare the size of cells and how their structure and shape differ depending on their function.
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Comparing Plant Cells
Students observe onion cells and elodea cells using the light microscope. Students compare structures found in each type of cell and create drawings.