mitosis meiosis worksheet - Free Printable

Problem Overview:

The task involves answering questions about mitosis and meiosis, two fundamental processes of cell division. The questions cover the purpose, stages, outcomes, and differences between these processes. Additionally, there are instructions to draw and label diagrams for specific stages.

Below is a detailed explanation and solution for each question:

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1. Describe the purpose of mitosis

- Answer: Mitosis is the process of cell division that results in two genetically identical daughter cells. Its primary purpose is to ensure the growth, repair, and maintenance of tissues in multicellular organisms by producing new cells with the same genetic material as the parent cell.

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2. How many times does the cell divide during mitosis?

- Answer: During mitosis, the cell divides once. This single division produces two daughter cells, each with the same number of chromosomes as the parent cell.

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3. What kind of cells are produced at the end of mitosis?

- Answer: At the end of mitosis, two diploid daughter cells are produced. These cells have the same number of chromosomes as the parent cell (e.g., 46 chromosomes in human somatic cells).

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4. What are sister chromatids?

- Answer: Sister chromatids are two identical copies of a chromosome formed during DNA replication in the S phase of interphase. They are attached at the centromere and separate during anaphase of mitosis or meiosis II.

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5. Briefly describe what happens during prophase

- Answer: During prophase:
- Chromosomes condense and become visible under a microscope.
- The nuclear envelope breaks down.
- The mitotic spindle begins to form as microtubules extend from the centrosomes (which move to opposite poles of the cell).
- Chromosomes attach to the spindle fibers via their kinetochores.

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6. Draw and label a picture of what a cell looks like during prophase

- Instructions: On the back of the page, draw a cell showing condensed chromosomes, the breakdown of the nuclear envelope, and the beginning formation of the mitotic spindle. Label key structures such as chromosomes, centrosomes, and spindle fibers.

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7. Briefly describe what happens during metaphase

- Answer: During metaphase:
- Chromosomes align at the metaphase plate (the equatorial plane of the cell) with their kinetochores attached to spindle fibers from opposite poles.
- This alignment ensures that each daughter cell will receive one copy of each chromosome.

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8. Draw and label a picture of what a cell looks like during metaphase

- Instructions: On the back of the page, draw a cell showing chromosomes aligned at the metaphase plate. Label the metaphase plate, kinetochores, spindle fibers, and chromosomes.

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9. Briefly describe what happens during anaphase

- Answer: During anaphase:
- Sister chromatids separate at the centromere and are pulled toward opposite poles of the cell by the spindle fibers.
- Each set of separated chromatids becomes a full chromosome.

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10. Draw and label a picture of what a cell looks like during anaphase

- Instructions: On the back of the page, draw a cell showing sister chromatids being pulled apart by spindle fibers. Label the spindle fibers, centromeres, and separating chromatids.

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11. Briefly describe what happens during telophase

- Answer: During telophase:
- Chromosomes reach the opposite poles of the cell and begin to decondense.
- A new nuclear envelope forms around each set of chromosomes.
- The mitotic spindle disassembles.

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12. Draw and label a picture of what a cell looks like during telophase

- Instructions: On the back of the page, draw a cell showing chromosomes at opposite poles, the reformation of the nuclear envelope, and the disassembly of the spindle fibers. Label these structures.

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13. Is cytokinesis part of mitosis?

- Answer: Yes, cytokinesis is the final stage of mitosis where the cytoplasm divides, resulting in two separate daughter cells. It typically occurs immediately after telophase.

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14. Briefly describe what happens during cytokinesis

- Answer: During cytokinesis:
- In animal cells, a cleavage furrow forms at the cell's equator, pinching the cell into two.
- In plant cells, a cell plate forms along the metaphase plate, eventually developing into a new cell wall that separates the two daughter cells.

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15. Draw a picture of what a cell looks like during cytokinesis

- Instructions: On the back of the page, draw a cell undergoing cytokinesis. For animal cells, show the cleavage furrow. For plant cells, show the forming cell plate. Label these structures.

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16. Describe the purpose of meiosis

- Answer: Meiosis is a specialized type of cell division that reduces the chromosome number by half, producing haploid gametes (sperm and egg cells). Its primary purpose is to ensure genetic diversity through the production of unique combinations of chromosomes in offspring.

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17. How many times does the cell divide during Meiosis?

- Answer: During meiosis, the cell divides twice—first during meiosis I and then during meiosis II. This results in four haploid daughter cells.

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18. What kind of cells are produced at the end of meiosis?

- Answer: At the end of meiosis, four haploid daughter cells are produced. Each cell has half the number of chromosomes as the parent cell (e.g., 23 chromosomes in human gametes).

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19. Briefly describe the difference of prophase I & II

- Answer:
- Prophase I:
- Homologous chromosomes pair up and undergo crossing over (exchange of genetic material).
- Spindle fibers begin to form, and the nuclear envelope breaks down.
- Prophase II:
- Similar to prophase in mitosis, but no homologous pairing or crossing over occurs.
- Spindle fibers form, and the nuclear envelope breaks down.

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20. Draw and label a picture of prophase I & II

- Instructions: On the back of the page, draw and label diagrams for both prophase I (showing homologous pairing and crossing over) and prophase II (showing typical mitotic features without homologous pairing).

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21. Briefly describe the difference of metaphase I & II

- Answer:
- Metaphase I:
- Homologous pairs of chromosomes align at the metaphase plate.
- Spindle fibers attach to the kinetochores of homologous chromosomes.
- Metaphase II:
- Individual chromosomes align at the metaphase plate.
- Spindle fibers attach to the kinetochores of sister chromatids.

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22. Draw and label a picture of metaphase I & II

- Instructions: On the back of the page, draw and label diagrams for both metaphase I (showing homologous pairs aligned) and metaphase II (showing individual chromosomes aligned).

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23. Briefly describe the difference of anaphase I & II

- Answer:
- Anaphase I:
- Homologous chromosomes separate and are pulled toward opposite poles.
- Sister chromatids remain attached at the centromere.
- Anaphase II:
- Sister chromatids separate at the centromere and are pulled toward opposite poles.

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24. Draw and label a picture of anaphase I & II

- Instructions: On the back of the page, draw and label diagrams for both anaphase I (showing homologous chromosomes separating) and anaphase II (showing sister chromatids separating).

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25. Briefly describe the difference of telophase I & II

- Answer:
- Telophase I:
- Chromosomes reach opposite poles, and the nuclear envelope may begin to reform.
- Cytokinesis follows, resulting in two haploid cells.
- Telophase II:
- Chromosomes decondense, and the nuclear envelope reforms.
- Cytokinesis follows, resulting in four haploid cells.

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26. Draw and label a picture of telophase I & II

- Instructions: On the back of the page, draw and label diagrams for both telophase I (showing chromosomes at opposite poles) and telophase II (showing similar features but with more cells forming).

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27. What would happen to cell division if a chemical was put in the cell that did not allow cell division to occur?

- Answer: If a chemical prevents cell division:
- Cells would stop dividing, leading to a lack of growth, repair, and replacement of damaged or old cells.
- In multicellular organisms, this could result in developmental defects, tissue damage, or even death.
- In cancer cells, it could halt tumor growth, which is why some chemotherapy drugs target cell division.

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Final Answer Summary:

Each question has been addressed with a clear explanation. Diagrams should be drawn on the back of the page as instructed, ensuring all stages and differences are accurately labeled.

Final Answer: \boxed{\text{See detailed explanations above.}}