Question: Online Onion Root Tips Determining Time Spent In Different Phases Of The Cell Cycle Growth In An Organism Is Carefully Controlled By Regulating The Cell Cycle. In Plants, The Roots Continue To Grow As They Search For Water And Nutrients. These Regions Of Growth Are Good For Studying The Cell Cycle Because At Any Given Time, You Can Find Cells That Are …

Question: Online Onion Root Tips Determining Time Spent In Different Phases Of The Cell Cycle Growth In An Organism Is Carefully Controlled By Regulating The Cell Cycle. In Plants, The Roots Continue To Grow As They Search For Water And Nutrients. These Regions Of Growth Are Good For Studying The Cell Cycle Because At Any Given Time, You Can Find Cells That Are …

Online Onion Root Tips Determining time spent in different phases of the cell cycle Growth in an organism is carefully contro
Online Onion Root Tips Determining time spent in different phases of the cell cycle The life cycle of the cell is typically d
Online Onion Root Tips Determining time spent in different phases of the cell cycle The assignment In this activity, you will
1. Determine the number of cells in each phase of mitosis. Enter your data into a table similar to the one shown below. 2. De

need answer

Interphase Prophase
Metaphase Anaphase
Telophase

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Online Onion Root Tips Determining time spent in different phases of the cell cycle Growth in an organism is carefully controlled by regulating the cell cycle. In plants, the roots continue to grow as they search for water and nutrients. These regions of growth are good for studying the cell cycle because at any given time, you can find cells that are undergoing mitosis. Cells in the tip of an onion root In order to examine cells in the tip of an onion root, a thin slice of the root is placed onto a microscope slide and stained so the chromosomes will be visible. The cells you’ll be looking at in this activity were photographed with a light microsope and then digitized so you can see them on the computer. Although slicing the onion root captures many cells in different phases of the cell cycle, keep in mind that the cell cycle is a continuous process. Scientists have divided the process into 5 phases, each characterized by important events, but these divisions are still arbitrary. Online Onion Root Tips Determining time spent in different phases of the cell cycle The life cycle of the cell is typically divided into 5 major phases. The phases are listed below, along with the major events that occur during each phase. Interphase. The cell is engaged in metabolic activity and performing its duty as part of a tissue. The DNA duplicates during interphase to prepare for mitosis (the next four phases that lead up to and include nuclear division). Chromosomes are not clearly discerned in the nucleus, although a dark spot called the nucleolus may be visible. Prophase. Chromatin in the nucleus begins to condense and becomes visible in the light microscope as chromosomes. The nuclear membrane dissolves, marking the beginning of prometaphase. Proteins attach to the centromeres creating the kinetochores. Microtubules attach at the kinetochores and the chromosomes begin moving. Metaphase. Spindle fibers align the chromosomes along the middle of the cell nucleus. This line is referred to as the metaphase plate. This organization helps to ensure that in the next phase, when the chromosomes are separated, each new nucleus will receive one copy of each chromosome. Anaphase. The paired chromosomes separate at the kinetochores and move to opposite sides of the cell. Motion results from a combination of kinetochore movement along the spindle microtubules and through the physical interaction of polar microtubules. ase. New membranes form around the daughter nuclei while chromosomes disperse and are no longer visible under the light microscope. Cytokinesis or the partitioning of the cell may also begin during this stage. Online Onion Root Tips Determining time spent in different phases of the cell cycle The assignment In this activity, you will be presented with cells from the tip of an onion root. You will classify each cell based on what phase it is in. At the end you will count up the cells found in each phase and use those numbers to predict how much time a dividing cell spends in each phase. You can base your calculation on a total cell cycle of 24 hours. Copy this table onto a piece of paper. You can enter data in this table as you go along, or at the end of the activity Interphase Prophase Metaphase Metaphase Anaphase Telophase Total number of cells percent 36 of cells 100% Previne in 1. Determine the number of cells in each phase of mitosis. Enter your data into a table similar to the one shown below. 2. Determine the percentage of cells in each phase of mitosis. Record these numbers in your table. 3. Construct a Pie chart showing the percentage of cells in each phase. (Google Sheets or Excel are effective software choices) 4. Determine the mitotic index (% of cells in mitosis) for Allium foot tip cells 5. Determine the number of hours of the cell cycle for each phase based on a cell cycle time of 28 hours for Allium cepa (onion). Interphase Prophase Metaphase Anaphase Telophase