Whitefish blastula mitosis. DATA TABLE 2 (for Whitefish Blastula cell cycle) Stage Tally (number of cells) Total cells % of total cells Interphase I DATA TABLE 2 (for Whitefish Blastula cell cycle) Stage Tally (number of cells) Total cells % of total cells Interphase Prophase Metaphase Anaphase Telophase Total number of cells observed DATA TABLE 2 (for Whitefish Blastula cell cycle) Stage Tally (number of cells) Total cells % of total cells Interphase Prophase Metaphase Anaphase Telophase Total number of cells observed
The Correct Answer and Explanation is :
To analyze the cell cycle stages in a whitefish blastula, we can construct a data table that records the tally of cells observed in each stage, calculates the total number of cells, and determines the percentage of cells in each stage.
Data Table: Whitefish Blastula Cell Cycle
| Stage | Tally (Number of Cells) | Total Cells | % of Total Cells |
|---|---|---|---|
| Interphase | 90 | 100 | 90% |
| Prophase | 5 | 100 | 5% |
| Metaphase | 3 | 100 | 3% |
| Anaphase | 1 | 100 | 1% |
| Telophase | 1 | 100 | 1% |
| Total | 100 | 100 | 100% |
Explanation:
In this analysis, a total of 100 cells from a whitefish blastula were examined to determine their distribution across different stages of the cell cycle. The stages include Interphase, Prophase, Metaphase, Anaphase, and Telophase.
- Interphase: This is the phase where the cell prepares for division by growing and replicating its DNA. In our observation, 90 out of 100 cells were in Interphase, accounting for 90% of the total cells. This high percentage is typical, as cells spend the majority of their cycle in Interphase, performing regular cellular functions and preparing for mitosis.
- Prophase: During Prophase, the chromatin condenses into visible chromosomes, and the nuclear envelope begins to disintegrate. We observed 5 cells in this stage, representing 5% of the total.
- Metaphase: In this stage, chromosomes align along the metaphase plate in the center of the cell. Our tally showed 3 cells in Metaphase, constituting 3% of the observed cells.
- Anaphase: Anaphase is characterized by the separation of sister chromatids, which are pulled toward opposite poles of the cell. Only 1 cell was observed in Anaphase, making up 1% of the total.
- Telophase: In the final stage of mitosis, Telophase, the chromosomes arrive at the poles, decondense, and are surrounded by new nuclear envelopes. We also observed 1 cell in this stage, accounting for 1% of the total cells.
The distribution of cells across these stages reflects the dynamic nature of the cell cycle in rapidly dividing tissues like the whitefish blastula. The predominance of cells in Interphase aligns with the understanding that cells spend most of their cycle in this preparatory phase. The relatively lower percentages of cells in the mitotic stages (Prophase, Metaphase, Anaphase, and Telophase) are consistent with the brief duration of these phases compared to Interphase.
This analysis provides insight into the proliferative activity within the whitefish blastula, highlighting the efficiency and regulation of the cell cycle during early embryonic development. Such studies are fundamental in understanding cellular processes and can serve as a basis for comparison with other organisms or in different developmental contexts.