Question: An onion root tip is observed and the whole onion root tip has 300 cells in total. Of these 300 cells, 198 are in interphase 45 are in prophase 33 aral metaphase 15 are un anaphase and 9 are in telophase.
What happens during telophase?
Telophase is the fifth and final phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. During telophase, a nuclear membrane forms around each set of chromosomes to separate the nuclear DNA from the cytoplasm.
What is mitosis in onion root tip?
An onion root tip is a rapidly growing part of the onion and thus many cells will be in different stages of mitosis. The super coiled chromosomes during different stages of mitosis present in the onion root tip cells can be visualized by treating with DNA specific stains, like Feulgen stain and Acetocarmine stain.
How many chromosomes do onion root tip cells contain?
The root tip cells of onion were used to test the potentially genotoxic effects of Alprazolam. The test was carried out according to Fiskesjö protocol (4, 11-12) with some modifications. Common onion (Allium cepa L.) has eight pairs of relatively large chromosomes (2n = 16) that allows for the easy detection of CAs.
In which area of the onion root tip do most of the cells appear to be undergoing mitosis?
apical meristem
The root tip of a plant contains an apical meristem that facilitates the growth in length of the root. The apical meristem is just a small area at the end of the root tip where mitosis occurs (see Figure 1).
Is there cytokinesis after telophase?
Cytokinesis, the division of the cytoplasm to form two new cells, overlaps with the final stages of mitosis. It may start in either anaphase or telophase, depending on the cell, and finishes shortly after telophase.
How can you tell if a cell is in telophase?
When you look at a cell in telophase under a microscope, you will see the DNA at either pole. It may still be in its condensed state or thinning out. The new nucleoli may be visible, and you will note a cell membrane (or cell wall) between the two daughter cells.
What are 4 things that happen during telophase?
During telophase, the chromosomes begin to decondense, the spindle breaks down, and the nuclear membranes and nucleoli re-form. The cytoplasm of the mother cell divides to form two daughter cells, each containing the same number and kind of chromosomes as the mother cell.
What structure reappears during telophase?
Telophase. The spindle disappears, a nuclear membrane re-forms around each set of chromosomes, and a nucleolus reappears in each new nucleus.
What will happen if root tip is cut accidentally in the plants?
Answer: The plant will die within few days of replanting it. This is because since the root tips are cut, the roots won’t grow because of absence of meristematic tissue. And if the roots will not grow, proper absorption of water an minerals will not occur.
What is the chromosome number of an onion cell during telophase?
16
The number of onions chromosomes are 16. Root tips of onion are used because the cells there are actively growing and dividing, giving a good chance to see chromosomes during different stages of cell division.
Is onion a root or a stem?
Onion is root,or stem or leaf. Onion is a converted underground stem known as the Tunicated Bulb. The other two types are Ginger and potato. In onion the buckles are filled with juice and covered each other and form a bulb. These bucles are separated by a thin membrane. It has root below and leaves in the above.
What is onion root tip mitosis?
Overview. Mitosis refers to a type of cell division (cell cycle) through which the cell (parent cell) produces two identical daughter cells.
Is onion a taproot?
Taproot consists of the one, long main root, where secondary, tertiary and rootlets are visible. Examples of plants with tap roots are carrot, reddish, beets, etc. On the other hand onion, grass, wheat, coconut palm are the examples of the fibrous roots or adventitious root system.
Is a green onion a root?
Green onions are also referred to as bunching onions, and have a milder onion taste than storage onions. They are actually immature onions that are harvested before the bulb matures. The green onion features a dark green stem (also called scallions) and a white bulb with roots.
