Mitosis Worksheet | PDF | Mitosis | Cell Cycle - Free Printable
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Step-by-step solution for: Mitosis Worksheet | PDF | Mitosis | Cell Cycle
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Show Answer Key & Explanations
Step-by-step solution for: Mitosis Worksheet | PDF | Mitosis | Cell Cycle
It looks like you've uploaded a worksheet titled "Cell Cycle, Mitosis, & Cancer Review" with a series of questions related to the cell cycle and mitosis. However, I can't directly view or analyze images. But based on your description and the text visible in the image, I can help you solve the problems and explain the solutions.
Here’s a breakdown of the questions and their answers based on standard biology knowledge:
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Answer: The correct answer is Interphase.
Explanation: Interphase is the phase before mitosis where the cell grows, performs its normal functions, and replicates its DNA. It includes three stages: G₁ (Gap 1), S (Synthesis), and G₂ (Gap 2). During the S phase, DNA replication occurs.
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Answer: Cytokinesis is the division of the cytoplasm resulting in two daughter cells.
Explanation: After mitosis (nuclear division), cytokinesis divides the cytoplasm to form two separate cells. In animal cells, this happens via a cleavage furrow; in plant cells, it occurs through a cell plate.
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Answer: Growth phase: Makes organelles and proteins needed for replication.
Explanation: During the G₁ phase, the cell grows and synthesizes proteins and organelles in preparation for DNA replication.
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Answer: DNA is replicated → synthesis.
Explanation: The S phase is when DNA replication occurs. Each chromosome is duplicated, forming two sister chromatids joined at the centromere.
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Answer: G₂ phase: Cell gets ready to undergo mitosis. This phase contains a G₂ checkpoint. If DNA is damaged, the cell cycle stops here.
Explanation: The G₂ phase is the final growth phase before mitosis. The cell checks for DNA damage and ensures everything is ready for division.
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Answer: Prophase: Chromatin condenses into chromosomes, nuclear envelope breaks down, spindle fibers begin to form.
Explanation: During prophase, chromatin coils tightly into visible chromosomes. The nucleolus disappears, and the mitotic spindle starts forming.
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Answer: Metaphase: Sister chromatids line up along the metaphase plate in the middle. Spindle fibers attach to the centromeres of the chromosomes.
Explanation: In metaphase, chromosomes align at the center of the cell (equator) and are attached to spindle fibers from opposite poles.
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Answer: Anaphase: Sister chromatids separate and move to opposite sides of the cell.
Explanation: During anaphase, sister chromatids are pulled apart by the shortening of spindle fibers and move toward opposite poles of the cell.
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Answer: Telophase: Two nuclear envelopes begin forming around each set of chromosomes, and the chromosomes uncoil into chromatin.
Explanation: Telophase marks the end of mitosis. Nuclear envelopes reform around the separated chromosomes, which then decondense back into chromatin.
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Answer: Mitosis: Division of a cell's nucleus. Occurs in this order: prophase, metaphase, anaphase, telophase.
Explanation: Mitosis is the process of nuclear division that results in two genetically identical nuclei. It consists of four main phases: prophase, metaphase, anaphase, and telophase.
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The diagram likely shows the stages of mitosis labeled A–E. Based on typical diagrams:
- A = Interphase (before mitosis)
- B = Prophase
- C = Metaphase
- D = Anaphase
- E = Telophase
You may be asked to label these stages or identify them based on the appearance of chromosomes and spindle fibers.
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- Cancer connection: The worksheet also touches on cancer, which arises when the cell cycle checkpoints fail (e.g., due to mutations in tumor suppressor genes like p53).
- Always ensure that DNA is properly replicated and checked before entering mitosis to prevent errors.
If you have specific questions about the diagram or need help filling in blanks, feel free to describe them!
Here’s a breakdown of the questions and their answers based on standard biology knowledge:
---
A. Interphase
Answer: The correct answer is Interphase.
Explanation: Interphase is the phase before mitosis where the cell grows, performs its normal functions, and replicates its DNA. It includes three stages: G₁ (Gap 1), S (Synthesis), and G₂ (Gap 2). During the S phase, DNA replication occurs.
---
B. Cytokinesis
Answer: Cytokinesis is the division of the cytoplasm resulting in two daughter cells.
Explanation: After mitosis (nuclear division), cytokinesis divides the cytoplasm to form two separate cells. In animal cells, this happens via a cleavage furrow; in plant cells, it occurs through a cell plate.
---
C. Growth Phase (G₁ Phase)
Answer: Growth phase: Makes organelles and proteins needed for replication.
Explanation: During the G₁ phase, the cell grows and synthesizes proteins and organelles in preparation for DNA replication.
---
D. S Phase (Synthesis Phase)
Answer: DNA is replicated → synthesis.
Explanation: The S phase is when DNA replication occurs. Each chromosome is duplicated, forming two sister chromatids joined at the centromere.
---
E. G₂ Phase
Answer: G₂ phase: Cell gets ready to undergo mitosis. This phase contains a G₂ checkpoint. If DNA is damaged, the cell cycle stops here.
Explanation: The G₂ phase is the final growth phase before mitosis. The cell checks for DNA damage and ensures everything is ready for division.
---
F. Prophase
Answer: Prophase: Chromatin condenses into chromosomes, nuclear envelope breaks down, spindle fibers begin to form.
Explanation: During prophase, chromatin coils tightly into visible chromosomes. The nucleolus disappears, and the mitotic spindle starts forming.
---
G. Metaphase
Answer: Metaphase: Sister chromatids line up along the metaphase plate in the middle. Spindle fibers attach to the centromeres of the chromosomes.
Explanation: In metaphase, chromosomes align at the center of the cell (equator) and are attached to spindle fibers from opposite poles.
---
H. Anaphase
Answer: Anaphase: Sister chromatids separate and move to opposite sides of the cell.
Explanation: During anaphase, sister chromatids are pulled apart by the shortening of spindle fibers and move toward opposite poles of the cell.
---
I. Telophase
Answer: Telophase: Two nuclear envelopes begin forming around each set of chromosomes, and the chromosomes uncoil into chromatin.
Explanation: Telophase marks the end of mitosis. Nuclear envelopes reform around the separated chromosomes, which then decondense back into chromatin.
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J. Mitosis Definition
Answer: Mitosis: Division of a cell's nucleus. Occurs in this order: prophase, metaphase, anaphase, telophase.
Explanation: Mitosis is the process of nuclear division that results in two genetically identical nuclei. It consists of four main phases: prophase, metaphase, anaphase, and telophase.
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Diagram (Figure B):
The diagram likely shows the stages of mitosis labeled A–E. Based on typical diagrams:
- A = Interphase (before mitosis)
- B = Prophase
- C = Metaphase
- D = Anaphase
- E = Telophase
You may be asked to label these stages or identify them based on the appearance of chromosomes and spindle fibers.
---
Final Notes:
- Cancer connection: The worksheet also touches on cancer, which arises when the cell cycle checkpoints fail (e.g., due to mutations in tumor suppressor genes like p53).
- Always ensure that DNA is properly replicated and checked before entering mitosis to prevent errors.
If you have specific questions about the diagram or need help filling in blanks, feel free to describe them!
Parent Tip: Review the logic above to help your child master the concept of the cell cycle and mitosis worksheet.
