Problem Analysis:
The image provided is a worksheet on
mitosis from a science class. The task involves labeling the stages of mitosis in an animal cell and answering questions related to the process. Below, I will solve each part of the problem step by step.
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1. Label the following diagram of mitosis of an animal cell.
The diagram shows the stages of mitosis in an animal cell. Here are the labels for each stage:
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Interphase: This is the initial stage where the cell grows and replicates its DNA. The chromosomes are not visible as distinct structures.
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Prophase: During this stage, the chromatin condenses into visible chromosomes, and the nuclear envelope begins to break down.
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Metaphase: The chromosomes align at the metaphase plate (equatorial plane) in the center of the cell.
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Anaphase: Sister chromatids separate and move toward opposite poles of the cell.
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Telophase: Chromosomes reach the poles, decondense, and new nuclear envelopes form around the daughter nuclei.
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Cytokinesis: The cytoplasm divides, resulting in two daughter cells.
The labeled diagram should look like this:
```
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
```
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2. During which stage of a cell's cycle do the replicated chromosomes thicken and become visible?
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Answer:
Prophase
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Explanation: During prophase, the chromatin (uncoiled DNA) condenses into thick, visible chromosomes. This makes it easier to see the duplicated chromosomes under a microscope.
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3. In animal cells, which structure is thought to produce the spindle fibers that help separate the sister chromatids during anaphase?
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Answer:
Centrosomes
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Explanation: Centrosomes are organelles in animal cells that organize microtubules to form the mitotic spindle. During mitosis, the centrosomes move to opposite poles of the cell and emit spindle fibers that attach to the kinetochores of the chromosomes, pulling them apart during anaphase.
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4. Is this structure found in plant cells?
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Answer:
No
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Explanation: Plant cells do not have centrosomes. Instead, they use microtubule-organizing centers (MTOCs) located near the nucleus to organize the mitotic spindle. Plant cells rely on different mechanisms for spindle formation compared to animal cells.
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Final Answers:
1.
Labels for the diagram:
- Interphase
- Prophase
- Metaphase
- Anaphase
- Telophase
- Cytokinesis
2.
During which stage do chromosomes thicken and become visible?
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Prophase
3.
Which structure produces spindle fibers in animal cells?
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Centrosomes
4.
Are centrosomes found in plant cells?
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No
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Boxed Final Answer:
\[
\boxed{
\text{1. Labels: Interphase, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis} \\
\text{2. Prophase} \\
\text{3. Centrosomes} \\
\text{4. No}
}
\]
Parent Tip: Review the logic above to help your child master the concept of sw science 10 mitosis worksheet answers.
