Match the onion root tip cells from the Mitosis Virtual Lab to the correct phase.
The Correct Answer and Explanation is :
Correct Matching of Onion Root Tip Cells to Mitosis Phases
- Interphase – The cell appears as a normal, intact nucleus with chromatin spread out and no visible chromosomes.
- Prophase – Chromatin condenses into visible chromosomes, and the nuclear membrane starts breaking down.
- Metaphase – Chromosomes align at the center (equatorial plate) of the cell.
- Anaphase – Sister chromatids are pulled apart to opposite poles of the cell.
- Telophase – Chromosomes decondense, nuclear membranes reform, and the cell starts to divide.
- Cytokinesis – The cytoplasm splits, forming two daughter cells.
Explanation (300 Words)
Mitosis is a type of cell division that ensures genetic continuity by producing two identical daughter cells. The onion root tip is a commonly used specimen to study mitosis because it has a high rate of cell division.
During Interphase, the cell prepares for division by growing and replicating its DNA. The nucleus is visible, and the chromatin remains uncondensed. Though interphase is not part of mitosis, it is the longest phase of the cell cycle.
Prophase marks the beginning of mitosis. The chromatin condenses into chromosomes, becoming visible under a microscope. The nuclear envelope starts to break down, and spindle fibers begin to form.
In Metaphase, the chromosomes align along the equatorial plate of the cell. This arrangement ensures that each new cell will receive an identical set of chromosomes when division is complete.
Anaphase follows, where the spindle fibers pull sister chromatids apart to opposite poles. This movement ensures each daughter cell gets the same number of chromosomes.
During Telophase, the chromatids reach the poles, and a new nuclear membrane forms around each set of chromosomes. The chromosomes begin to uncoil, and the cell starts its final division process.
Finally, Cytokinesis occurs, splitting the cytoplasm and forming two identical daughter cells, each with the same genetic material.
Observing onion root tip cells provides clear insights into these mitotic phases, helping students understand cell division at a microscopic level.