Question

23 on the following diagram, indicate how many chromosomes are in the cell and label each cell as either diploid (2n) or haploid (n). note that the meiosis column shows meiosis i for the first 4 images and telophase/cytokinesis ii for the last image. also note that there is a brief moment in the cell cycle where there is double the diploid number of chromosomes. you can note that brief moment as 4n.

Explanation:

Step1: Analyze Mitosis Prophase

Chromosomes replicated, cell is diploid with 2n (chromosome count is 2n, DNA is 4n but chromosome number remains 2n as sister chromatids are attached)

Step2: Analyze Mitosis Metaphase

Chromosomes aligned, still diploid 2n

Step3: Analyze Mitosis Anaphase

Sister chromatids separate, this is the brief 4n moment (chromosome count doubles temporarily as chromatids are now independent chromosomes)

Step4: Analyze Mitosis Telophase/Cytokinesis

Cells split, each is diploid 2n

Step5: Analyze Meiosis Prophase I

Cell is diploid, homologous pairs present: 2n

Step6: Analyze Meiosis Metaphase I

Homologous pairs aligned, diploid 2n

Step7: Analyze Meiosis Anaphase I

Homologous pairs separate, cell still has 2n chromosomes (chromatids attached)

Step8: Analyze Meiosis Telophase I

Cells split, each is haploid n

Step9: Analyze Meiosis II Telophase/Cytokinesis

Cells split again, all 4 cells are haploid n

Answer:

Mitosis Column:

1. Prophase: 2n (diploid)
2. Metaphase: 2n (diploid)
3. Anaphase: 4n (temporary double diploid)
4. Telophase/Cytokinesis: 2n (diploid, each new cell)

Meiosis Column:

1. Prophase I: 2n (diploid)
2. Metaphase I: 2n (diploid)
3. Anaphase I: 2n (diploid)
4. Telophase I: n (haploid, each new cell)
5. Telophase/Cytokinesis II: n (haploid, each of the 4 cells)