Cell division lab report Marine Biology PDF

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this is a study assignment for the Cell division lab report for Marine science and Biology I hope this helps you....

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Cell Division Virtual Lab Activity Instructions: The Virtual Cell Division Lab is on the lesson assessment page. On the image, it says “Click Anywhere to Start.” Follow the instructions as you move through the lab. The lab activity will keep count of your data on the right, and you can record this into the data table. Title: Cell Division Lab Objective(s): Is to observe each stages of mitosis and the cell cycle to see how much time a dividing cell spends in each phase. Hypothesis: I hypothesis that the interphase stage will be more observed because Cells spend most of their time in the interphase stage. Variables: Independent variable- cells appearance Dependent variable- # of cells in each phase Controlled variable- microscope Data: Record the number of cells you observed in the lab activity. Stages Interphase Prophase

Number of Cells 34 8

Metaphase

3

Anaphase Telophase

2 2

Cytokinesis

1

Observations: Record any observations about the cells you observed. What does the cell look like for each stage? What is a distinguishing visible feature of each stage of the cell cycle? Stages Interphase

Description of Cell The chromatin is scattered in different spots.

Prophase Metaphase Anaphase Telophase Cytokinesis

The sister chromatids are in the shape of an X. The sister chromatid pairs are lined up in the middle of the cell. The sister chromatids are divided and are being held by The centromeres. New membranes form around each set of chromosomes while the chromosomes spread out into chromatin. The cell divides into two seperate daughter cells.

Data Analysis: Part 1: Calculate the percentage of the cell cycle spent in each stage. Number of cells in given stage ÷ total number of cells counted × 100 = % of the cell cycle spent in this stage Interphase- 68%, Prophase- 16%, Metaphase- 6%, Anaphase & Telophase- both 4%, and Cytokinesis- 2% Part 2: Using your percentages in part 1, create a graph that represents the time spent in each stage of the cell cycle. Insert Chart [Hint: don’t forget to consider the relationship between your data and the type of chart to best represent your data] Conclusion: Be sure to answer the following reflection questions as a summary in the conclusion of your lab report: • Was your hypothesis correct? Why or why not? Be sure to include evidence from the data you collected to support your conclusion. Yes, my hypothesis was correct the Interphase was more observed because the Cells spend most of their time in the interphase stage. • Based on your data, what can you infer about the length of time spent in each stage of the cell cycle? The cells spent more time in the interphase stage and less time in the cytokinesis stage. • What stages were the longest and shortest? Give a brief explanation of why these stages may have that time period. The longest stage was the interphase stage because the interphase is the part of the cell cycle that is dedicated to working and growing. The shortest stage was the cytokinesis stage because cytokinesis is the division of the cytoplasm, organelles, and other material contained within the cell. Questions: Using what you have learned in the lesson and the virtual lab activity, answer the following questions in complete sentences.

• What differences can you see when you compare the nucleus of a dividing cell with that of a non-dividing cell? The difference is that chromosomes will be seen in the nucleus of the dividing cell because they become visible when a cell is dividing unlike non-dividing cells. • If your observation had not been restricted to the tip of the onion root, how would the results be different? There would have been more or less cells observed that would have changed the results....