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For note: This is the Cell Division Gizmo worksheet answers from Zach Nemets. You will be able to check his answer to learn Cell Division Gizmo Worksheet.
Cell Division – Prior Knowledge Questions
- Cells reproduce by splitting in half, a process named cell division. What do cells need to do between divisions to ensure that they do not get smaller and smaller?
Answer: They need to grow in between division
- The genetic information of a cell is carried in its DNA (short for deoxyribonucleic acid). What do cells require to do between divisions to ensure that a full set of DNA gets passed on to each daughter cell?
Answer: The DNA has to be copied
Cell Division – Gizmo Warm-up Questions
- Look at the cells. Do they all look the same?
- Cells that are in the process of dividing are said to be in mitosis or cytokinesis. Cells that are not dividing are in interphase. Check the Magnify box and move the cursor over the cells. Cells that are in the process of dividing are said to be in mitosis or cytokinesis. Cells which are not dividing are in interphase. Please check the Magnify box and move the cursor over the cells.
A. Of the 100 cells shown, how many are in the process of dividing?
B. Select the BAR CHART tab, and turn on Show numerical values. How many cells are in the interphase stage of their life cycle?
C. Based on these two observations, would you say that a cell spends most of its life cycle in interphase or in mitosis/cytokinesis?
Cell Division – What are the Stages of the Cell Cycle?
- Click Play and hold the cursor over the cell. Observe the cell as it divides some times. What do you notice happening during the process?
Answer: You are able to see the chromosomes line up then separate and then you see two nucleuses then the cell splits
- On the DESCRIPTION pane, read about each phase in the cell cycle. Summarize what happens in your own words
- Interphase: The cell grows and develops, developing organelles and copying its DNA
- Prophase: The nuclear membrane dissolves away, the chromatin condenses into chromosomes. Spindle fibers form between the centrioles, which move to opposite ends of the cell
- Metaphase: The spindle fibers pull the chromosomes to line them up on the equator
- Anaphase: The chromosomes are split apart by the fibers, and the chromatids move to opposite sides of the cell
- Telophase: A nucleus forms around each of the chromosomes and they deform into chromatin
- Cytokinesis: The cell membrane divides the cell into two daughter cells
3. Use your summaries and the Gizmo to answer the following questions:
A. What are the four phases of mitosis?
Answer: Prophase, Metaphase, Anaphase and Telophase
B. During which phase is the DNA duplicated?
C. What is the relationship between chromatin and chromosomes?
Answer: Chromatin is a substance within chromosomes with DNA and protein
D. In which phase are chromatids pulled apart?
E. What is the role of the centrioles?
Answer: They have spindle fibers around them and they help determine the location of the nucleus
F. In which phase does a new nuclear membrane develop?
G. A cell has a single line of chromosomes. What is the phase?
H. During which three phases are individual chromosomes no longer visible?
Answer: Interphase, Telophase and Cytokinesis
4. Why is it crucial that the cell’s DNA is duplicated before cell division?
Answer: The DNA requires to be duplicated before the cell divides, so that both new daughter cells have the same amount of DNA
5. Human cells have 46 chromosomes. Each chromosome will consist of a pair of identical chromatids attached together by a structure called a centromere. After the chromosome has split, each chromatid is called a daughter chromosome. At the end of cytokinesis, how many daughter chromosomes will be discovered in each cell?
Answer: There will be 0 because during telophase, the chromatids dissolve into chromatin
Cell Division – What is the Relative Duration of Each Phase of the Cell Cycle?
Here are some questions of them:
Which phase of the cell cycle is longest? Interphase Shortest? Anaphase
Explain your answers:
- Which phase of the cell cycle is longest? Shortest? Explain your answers!
Answer: The longest is Interphase, the shortest is Anaphase. The more cells in the cycle then the longer it takes, and the less cells in the cycle the shorter it takes.
- You can use your data to estimate the duration of each phase of the cell cycle. For example, if 8% of the cells were in prophase and the cell cycle was 10 hours long, then prophase would last 8% of 10 hours, or 0.8 hours (48 minutes). Please use percentages to estimate the duration of each phase of the cell cycle. Show your work!
Interphase: 0.845×10=8.45 8hr27min
Prophase: 0.077×10=0.77 46.2min
Metaphase: 0.01×10= 0.1 6 min
Anaphase: 0.025×10=0.25 15min
Telophase: 0.02×10=0.2 12min
Cytokinesis: 0.03×10=0.3 18min
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