Worksheet on mitosis and cell division, featuring questions, a data table, and labeled diagrams of cell phases.

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Question 28:

> Which phase of mitosis spends most of its time?
> *(Hint: The phase that has the highest percentage of cells in it is the one that takes the most time.)*

From the table:

| Phase | Number of cells | Percentage of cells |
|--------------|------------------|----------------------|
| Interphase | 39 | 22% |
| Prophase | 39 | 22% |
| Metaphase | 42 | 24% |
| Anaphase | 16 | 9% |
| Telophase | 6 | 3% |

Wait — there's an error here. The percentages don’t add up to 100%. Let’s double-check the total:

- Total cells = 39 + 39 + 42 + 16 + 6 = 142

Now calculate correct percentages:
- Interphase: (39/142) × 100 ≈ 27.5%
- Prophase: (39/142) × 100 ≈ 27.5%
- Metaphase: (42/142) × 100 ≈ 29.6%
- Anaphase: (16/142) × 100 ≈ 11.3%
- Telophase: (6/142) × 100 ≈ 4.2%

So the highest percentage is Metaphase (~29.6%), but this contradicts biological knowledge. In reality, Interphase is the longest phase because it includes DNA replication and preparation for division.

But wait — the table says "Number of cells" observed in each phase. If Interphase has 39 cells, and Metaphase has 42, then Metaphase would be the phase where the most cells are found at that moment.

However, the phase that takes the most time is not necessarily the one with the most cells at a snapshot — but rather, the one with the highest proportion of cells over time.

But since we're given a snapshot of 142 cells, the percentage of cells in each phase reflects how long that phase lasts (because cells spend more time in longer phases, so more are caught in them).

So let's recalculate correct percentages:

Total = 39 + 39 + 42 + 16 + 6 = 142

- Interphase: 39 / 142 ≈ 27.5%
- Prophase: 39 / 142 ≈ 27.5%
- Metaphase: 42 / 142 ≈ 29.6%
- Anaphase: 16 / 142 ≈ 11.3%
- Telophase: 6 / 142 ≈ 4.2%

So Metaphase has the highest percentage → cells spend the most time in metaphase?

That doesn't match biology. Usually, interphase is the longest phase.

But note: Interphase is NOT part of mitosis — it's before mitosis.

Let’s clarify:

- Mitosis includes: Prophase, Metaphase, Anaphase, Telophase.
- Interphase is before mitosis and includes G1, S, G2.

So the question says: "Which phase of mitosis spends most of its time?"

So we only consider mitotic phases: Prophase, Metaphase, Anaphase, Telophase.

From the table:

- Prophase: 39 cells → ~27.5%
- Metaphase: 42 cells → ~29.6%
- Anaphase: 16 cells → ~11.3%
- Telophase: 6 cells → ~4.2%

So Metaphase has the highest number of cells → it takes the most time among mitotic phases.

But again, biologically, prophase is usually the longest mitotic phase.

However, based on the data in the table, the answer should be:

> ✔ Metaphase – because it has the highest percentage of cells (29.6%), indicating it takes the most time.

But wait — the table shows Interphase as 39 cells (27.5%), which is not part of mitosis.

So if we're asked about mitosis only, we ignore interphase.

So:

✔ Answer to Q28: Metaphase (based on data)

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Question 29:

> Of all the mitotic phases, which phase does the cell spend most of its time in?

Again, using the data: