BIO101L Lab 5.docx.pdf

These have been linked to different cancers lung

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polycyclic aromatic hydrocarbons. These have been linked to different cancers (lung, stomach, kidney, and others). DNA damage may also be inherited from a parent cell, such as the BRCA1 or BRCA 2 genes that can cause breast or ovarian cancers. (Mandal, A. (2017, October 31). What Causes Cancer? Retrieved June 12, 2018, from https://www.news-medical.net/health/What-Causes-Cancer.aspx) Experiment 1: Observation of Mitosis in a Plant Cell Table 1: Mitosis Predictions Predictions The cell spends most of its time in interphase, which I predict will take about 90% of the time. I predict that mitosis will take 8%, and cytokinesis will take 1%. Supporting Evidence A cell completes the division cycle within 18-24 hours. Mitosis takes 1-2 hours of that time. The rest of the time is spent in interphase. Table 2: Mitosis Data
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Lab 5 Mitosis BIO101L Stage Number of Cells in Each Stage Total Number of Cells Calculated % of Time Spent in Each Stage Interphase 19 26 82.6% Prophase 3 13% Metaphase 0 0 Anaphase 3 13% Telophase 1 4.4% Cytokinesis 0 0 Insert photos of your drawings of a dividing cell in the appropriate area for each stage of the cell cycle (please include your name in each of the sketches): Interphase: Prophase:
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Lab 5 Mitosis BIO101L Metaphase:
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Lab 5 Mitosis BIO101L Anaphase: Telophase:
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Lab 5 Mitosis BIO101L Cytokinesis:
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Lab 5 Mitosis BIO101L Post-Lab Questions 1. Label the arrows in the slide image below with the appropriate stage of the cell cycle. Structure Identity A Interphase B Cytokinesis C Prophase D Telophase E Anaphase F Metaphase
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Lab 5 Mitosis BIO101L 2. In what stage were most of the onion root tip cells? Based on what you know about cell cycle division, what does this imply about the life span of a cell? Most of root tip cells were in interphase, which is to be expected since it is the longest phase of cell division. This implies that most of the cell’s life cycle will be spent preparing for division by enlarging the cell and replicating the DNA.
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