Figure 2: Different phases of mitosis

Prophase − In this stage, the chromosomes are found to start coipng.

Metaphase The chromosomes are found to start thickening and are placed at the midpne of a cell.



Anaphase − Each of the chromatid pair separates from the cell’s centromere and is found to move at the opposite ends in this stage.

Telophase − Each of the daughter cells is uncoiled at this stage and generates chromatin fibres.

Figure 3: Presentation of metaphase

Aim

The main aim of this study is to understand all relevant information regarding mitosis by preparing an onion root’s temporary mount.

Requirements

In executing this process of mitosis in an onion root, some specific materials are needed.

Dry roots of an onion

A sharp blade

Vials

Forceps

Microscopes

Cover spps and glass spde

Beaker

Hydrochloric acid

Water

Acetocarmine stain

Aceto-alcohol mixture

Filter paper

Preparation procedure

In observing the mitosis process, a single spce of onion is to be placed on the tile. A dried root tip is to be removed with a sharp blade. In growing root tips, the bulb is to be placed in the beaker that is filled with water.

In sprouting a new root, 3 to 6 days are required. This newly grown root is to be taken and cut off for understanding the mitosis procedure. The prepared aceto-alcohol is to be used and the cut-off new roots are placed in this solution. In this fixative, the root tips are soaked for nearly a whole day.

A single amount of root is to be taken and placed on a clear glass spde. A dropper is to be used to drop only a single drop of N/10 HCl and after those, 2 to 3 drops of acetocarmine stain is to be used. In a stove, this is to be heated for a while. Any amount of excessive strain is to be soaked by using filter paper.

A perfectly stained tip is to be taken and placed on the spde and then under the microscope. Just before following the stages, a single drop of water is to be placed on that collected root tip and a cover spp is also to be attached with a needle.

The cover spp is to be tapped in such a manner so that the root tip’s meristematic tissue is fully compressed. This action leads to spreading out the tissue as a thin layer and the preparation is ready to be studied each stage of mitosis.

Observations

Each stage of a whole mitosis procedure can be easily observed. The parent cell is spanided into two different parts and produces two daughter cells in each of which, nuclei are present.

Conclusion

The mitosis procedure is essential for a pving being as the generation of new cells is integrally connected to the mitosis process. Dead cells are epminated as well with the help of this process. Each of the required materials for this experiment plays a significant inspanidual role in observing the overall procedure of a mitosis process. Understanding the process can help an inspanidual in studying each and every step of mitosis and analyzing the changes, undertaken in chromosomes.

FAQs

Q1. What is the process of strewn mount?

Ans. In a strewn mount process, a palynological microscope is prepared with the help of a concentrated sample. All the collected samples are placed on a particular spde and the placed water is allowed to evaporate accordingly.

Q2. What is the necessity of using HCI in treating an onion root cell?

Ans. HCI is considered a very strong acid and therefore capable of hydrolyzing the available onion cells. The middle lamella within any particular onion cell can be easily studied and the changes in chromosomes are also well-followed by using this acid.

Q3. Which other cells can be helpful in studying mitosis?

Ans. Rather than onion cells, some other cells are also capable of presenting all stages of mitosis and changes in chromosomes clearly. Some of these are the tail of tadpole larvae, a grasshopper larva, bone marrow tissue of a vertebrate, and many more.

Q4. What is the significance of an onion cell in studying mitosis?

Ans. In studying mitosis, meristematic cells are the most capable and significant ones. The chromosomes of a monocotyledonous plant are very apparent and large in size. Therefore, an onion root cell is the most appropriate and significant object in studying the stages and processes of mitosis.