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All living organisms are composed of cells.Earlier in the course, you explored cell structure and function. This week, you learn about how cells replace themselves and pass on their genetic traits.The cells in your body undergo a type of cell division known as mitosis to  replace damaged cells and enable new growth. In order to reproduce,  human beings and most animals use the type of cell division called meiosis.For this week’s Assignment, you complete a virtual lab in which you  explore mitosis and meiosis. You then learn about the impact a mutation can  have on either of these processes. Finally, you examine tissue samples  in a virtual biopsy lab and write a lab report based on your analysis.Review Chapter 6, “Reproduction at the Cellular Level” including:

• How mitosis and meiosis compare
• What a mutation is
• What cancer is and what causes it
• The causes and effects of various mutations
• Complete the Cellular Reproduction: Mitosis, Meiosis, and Mutation Virtual Lab.
• Complete the knowledge checks at the end of each section of the virtual lab.
• Download and save the Lab Report document from the Cellular Reproduction: Mitosis, Meiosis, and Mutation Virtual Lab.
• As you complete the Virtual Biopsy Lab, fill out the Biopsy Lab  Report. You may complete the analysis and conclusion sections of the lab  report after you exit the virtual lab.

Cellular Reproduction: Mitosis, Meiosis, and Mutation – Lab Report

Name:
Course:
Date:

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Part 1: Purpose

The purpose of this lab is to explore the processes of mitosis and meiosis, understand how genetic information is passed to new cells, and examine how mutations can alter these processes. In addition, this lab includes a virtual biopsy exercise to analyze real tissue samples and identify cancerous or abnormal cell growth.

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Part 2: Background Information

Mitosis

Mitosis is the type of cell division used by somatic (body) cells for growth, repair, and replacement. During mitosis, one parent cell produces two genetically identical diploid daughter cells. The stages of mitosis include:

• Prophase – chromosomes condense; nuclear membrane breaks down

• Metaphase – chromosomes align at the cell’s center

• Anaphase – sister chromatids separate

• Telophase – nuclear membranes reform

• Cytokinesis – cytoplasm divides

Meiosis

Meiosis is used to produce sex cells (gametes). Meiosis produces four genetically unique haploid cells and includes two divisions:

• Meiosis I – homologous chromosomes separate

• Meiosis II – sister chromatids separate

Genetic variation is increased through crossing over and independent assortment.

Comparison: Mitosis vs. Meiosis

Mutations

A mutation is any change in DNA sequence. Causes include:

• Errors during DNA replication

• Radiation

• Chemicals

• Viruses

Mutations in mitosis may lead to cancer if they disrupt normal cell-cycle regulation. Mutations in meiosis can create inherited genetic disorders.

Cancer

Cancer results from uncontrolled mitosis, usually due to mutations in:

• Proto-oncogenes (overactivity → oncogenes)

• Tumor suppressor genes (loss of function)

• DNA repair genes

Unregulated division leads to tumors and possible metastasis.

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Part 3: Virtual Lab Data

Mitosis Observations

(Insert your results in the spaces below.)

• Number of cells counted: ______

• Prophase: ______

• Metaphase: ______

• Anaphase: ______

• Telophase: ______

• Cytokinesis: ______

• Stage with the most cells: ______

• Abnormalities observed (if any): ______

Meiosis Observations

• Identified stages: __________________________________________

• Evidence of crossing over? Yes / No

• Explanation of genetic variation: ______________________________________________

Mutation Activity Observations

• Mutation type observed: _____________________________________

• Which process it affected (mitosis or meiosis): ___________________

• Resulting effects on the cell: ___________________________________

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Part 4: Virtual Biopsy Lab Report

A. Observations

Describe whether each sample appears normal or cancerous.
(Use your own findings from the biopsy slides.)

Signs of cancer may include:

• Enlarged or irregular nuclei

• Loss of organized tissue structure

• Excessive number of cells in mitosis

• Cells overlapping or crowding

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B. Analysis

1. Which samples contained cancerous cells? Explain why.

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2. How can a mutation lead to cancer?
   Mutations that disrupt cell cycle regulation—particularly in proto-oncogenes, tumor suppressor genes, or DNA repair genes—can cause cells to divide uncontrollably. This uncontrolled division leads to tumor formation.

3. Why does cancer spread (metastasize)?
   Cancer cells can break away from the primary tumor, enter the bloodstream or lymphatic system, and establish new tumors elsewhere. They lose the normal features that keep cells anchored and regulated.

4. How do biopsy results guide medical treatment?
   Biopsies identify cancer type, severity, and growth rate. This information helps determine whether treatment should include surgery, chemotherapy, radiation, immunotherapy, or monitoring.

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Part 5: Conclusion

This lab demonstrated how mitosis and meiosis function to support growth, repair, and reproduction in living organisms. Mitosis creates identical cells needed for bodily maintenance, while meiosis produces genetically diverse gametes. The lab also showed how mutations can disrupt these processes and lead to diseases such as cancer. Through the biopsy analysis, it became clear that abnormal cell structures and uncontrolled division are key indicators of cancer. Understanding cellular reproduction is essential for recognizing how genetic variation, disease, and cancer develop at the cellular level.

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References (APA format)

OpenStax. (2021). Biology (2nd ed.). OpenStax CNX.
(Include any additional sources if required by your instructor.)

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If you want, I can fully complete this report by inserting:

✔ Your mitosis counts
✔ Your meiosis observations
✔ Your mutation data
✔ Your biopsy sample conclusions

Just paste your results from the virtual lab, and I’ll finish the report.

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