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why are onion root tip cells used in this lab

by Alvena Feeney Published 3 years ago Updated 2 years ago
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Why is onion root tip used to demonstrate mitosis in this experiment? It is because of the meristematic cells that are situated in the tip of the roots that render the most desirable and suitable raw material to study the different stages of mitosis. Onion is a monocot plant.Oct 15, 2020

Can you find dividing cells in the onion root tip?

Sample answer: The root tip of a plant contains actively dividing cells, making root tips excellent observation points for mitosis. Each plant cell is surrounded by a cell wall, making the identification of cells easy. Why are onion cells used to study mitosis?

Why would onion root tip have many cells undergoing mitosis?

It is because of the meristematic cells that are situated in the tip of the roots that render the most desirable and suitable raw material to study the different stages of mitosis. Onion is a monocot plant. Monocotyledonous plants possess large chromosomes that are clearly visible. Hence, their root tips are used.

What is the function of cells in the onion root?

The function of an onion cell is to organize the biological processes of an onion. The onion, like other complex organisms, has different cells. There are cells that make up its leaves and flowers, cells that make up the onion bulb and cells that make up its roots.

Is onion root tip multicellular or unicellular?

No, you’ve got your terminology mixed up. “ Unicellular ” refers to a single-cell organism that can exist freely as a single-cell organism… IT DOES NOT MEAN “one cell.” An onion plant and human are both “ multicellular ” organisms. If you take one cell out the onion or one cell out of the human, you’ve isolated some cells but they cannot live independently and freely without the rest of the onion plant or human body.

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What is the purpose of onion root lab?

Assuming a cell cycle length of 24 hours, the time that a cell spends in each phase of mitosis can also be calculated. Thus, the purpose of the lab is to gain information about cell mitosis using images obtained with a microscope.

Why did we use onion root tip in our mitosis lab and no other tissue from this organism?

The onion root is also a good place because this is the area where the plant is growing. Remember that when cells divide, each new cell needs an exact copy of the DNA in the parent cell. This is why mitosis is only visible in cells that are dividing, like the whitefish embryo and the onion root tip.

Why is the onion root a good specimen for studying mitosis Why is the tip of a root growing faster than some other spot?

Why use onion root tips to show all these complex changes? Because the root tip is a fast growth area of the onion plant, cells are rapidly dividing. Also, the cells are large, so they are relatively easy to see, and the 16 chromosomes stain easily. Mitosis in Allium root tip cells is not synchronized.

Why is an onion root a good place to observe mitosis?

Why use onion roots for viewing mitosis? The roots are easy to grow in large numbers. cells can be observed. The chromosomes can be stained to make them more easily observable.

Why root tip is the best material to study mitosis?

Root tip as compared to the leaf tip is the best material to study mitosis. Root tip is a rapidly growing part of a plant body and thus many cells will be in different stages of mitosis.

Why is the onion root a good specimen for studying mitosis quizlet?

why is the onion root a good specimen for studying mitosis? Cells of the onion are growing so it is easy to find cells in various stages of mitosis.

Why are onion root tips a good choice for viewing cells in different stages of the cell cycle quizlet?

Explain why whitefish blastula and onion root tip are selected for the study of mitosis. These plants are selected because whitefish blastula and onion root tip have cells that rapidly divide, making it easier to see the different stags of mitosis under a microscope.

Why do we use the onion root tip and not the epithelial tissue of an onion?

Onion is a monocot plant. Monocotyledonous plants possess large chromosomes that are clearly visible. Hence, their root tips are used.

Why are onion root tips a good choice for viewing cells in different stages of the cell cycle quizlet?

Explain why whitefish blastula and onion root tip are selected for the study of mitosis. These plants are selected because whitefish blastula and onion root tip have cells that rapidly divide, making it easier to see the different stags of mitosis under a microscope.

Are cells undergoing mitosis in every part of the 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 onion root tips can be prepared and squashed in a way that allows them to be flattened on a microscopic slide, so that the chromosomes of individual cells can be observed easily.

Which tissue was present at the tip of the root of an onion?

apical meristematic tissueTips of the plant roots contain apical meristematic tissue, and is responsible for the elongation or length of the roots. As the tip of the onion roots in jar 2 is cut, apical meristematic tissue is removed from it. So there will not be any growth in the roots of the onion in jar 2 after the tips are cut.

Why do chromosomes become more visible in metaphase?

During metaphase, chromosomes become more visible because of increased condensation as well as the fact that the nuclear envelope has disappeared.

Why do microtubules pull centrioles?

As new components (building blocks) are added on one end of the microtubules and removed from the other, it has been suggested that this causes the microtubules to pull the centrioles which in turn contributes to the alignment of the chromosomes.

What is the name of the process where the cell produces two identical cells?

Mitosis refers to a type of cell division (cell cycle) through which the cell (parent cell) produces two identical daughter cells. Unlike meiosis, which is also a type of cell division, mitosis results in the production of two diploid daughter cells. The two daughter cells contain the same number of chromosomes as the parent cell.

Where are sister chromatids located?

Sister chromatids, which contain the same genetic information, are attached at a region known as the centromere which gives the structure an X shape.The kinetochore, which is the site at which microtubules join the chromosomes is also located at the centromere.

How long does onion root mitosis grow?

Onion root tip mitosis - growth to a length of about 1 inch. Credit: MicroscopeMaster.com

What is the second stage of mitosis?

Prometaphase is the second stage of mitosis (it has also been referred to as late prophase). This stage is characterized by increased condensation of chromosomes as well as the breakdown of the nuclear envelope (nuclear membrane).

How to put onion bulbs in jars?

Carefully place the onion bulbs in the glass/plastic jars so that only the lower surface of the onion comes in contact with the water.

What is the difference between interphase and prophase?

Interphase and Prophase. Interphase includes G1, S, G2. All of these steps cause the cell to be in here for 90% of its life. Prophase the chromatin begins to form into chromosomes.

Why is the cell plate not flexible?

During cytokinesis in plant cells.The cell membrane is not flexible enough to draw inward because of the rigid cell wall that surrounds it. Instead, a structure known as the cell plate forms halfway between the divided nuclei. The cell plate gradually develops into cell membranes that separate the two daughter cells.

What does it mean when an onion grows rapidly?

Rapidly growing part of the onion, indicates many cells will be in different stages of mitosis.

What is Unit 3?

Unit 3 you are what u eat

How to divide cells in each stage?

Divide number of cells in each stage by the total number of cells

Do plant cells have centrioles?

Animal cells have centrioles that support the organization of mitotic spindle and cytokinesis, but plant cells don't have centrioles. During cytokinesis animal cells, the cell membrane is drawn inward until the cytoplasm is pinched into two nearly equal parts. Each part contains its own nucleus and cytoplasmic organelles.

How to smooth out wrinkles on a microscope?

Carefully mount the onion peel on top of the microscope slide, making sure to smooth out wrinkles using the end of the pipette or with the use of your forceps. Using the pipette or dropper, apply one or two drops of iodine over the onion sample.

What do onion cells look like under a microscope?

What do onion cells look like under the microscope? Studying cell tissues from an onion peel is a great exercise in using light microscopes and learning about plant cells, since onion cells are highly visible under a microscope, especially when stained correctly.

How to analyze onion cells?

For this activity, you will need: 1 One onion peeled to a single layer (make sure that the layer isn’t too thick, or else you won’t be able to see the onion cell structure) 2 Specimen stain (in this activity, we will be using iodine, which is easily accessible and works well with onions to produce clear contrast) 3 A set of blank microscope slides to mount the specimen on 4 Cover slips to keep the specimen in place and protect the microscope lenses from coming into contact with the specimen 5 An eye dropper or pipette to create a wet mount (you can choose between disposable and reusable droppers) 6 Your lab sheet to take down your notes and observations on 7 A digital microscope or any simple light microscope

What are onion cells made of?

Onions are also made up of several layers, with a membrane or thin skin separating each layer. The main onion cell structures are quite easy to observe under medium magnification levels when using a light microscope. The cells look elongated, similar in appearance- color, size, and shape- have thick cell walls, ...

How are onion cells separated?

Onions are composed of several layers separated by thin membranes. In this activity, we will be using these thin membranes to observe onion cells in great detail. Obtaining a thin membrane from a bulb of onion is easy with the use of a pair of tweezers.

What is the best stain to use on onions?

As we mentioned above, iodine is the best stain to use when looking at onion cells. That said, there are other types of stains that can be used based on the type of cell that will be observed under the microscope, and some of these can be used on onions as well. Here is how common stains differ from one another:

How to get rid of bubbles in onion?

Using the pipette or dropper, apply one or two drops of iodine over the onion sample. Then, carefully place the cover slip over the stained sample, starting by dropping one end then the other end in order to prevent bubbles.

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1.Videos of Why Are Onion Root Tip cells Used in This Lab

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2 hours ago Keeping this in consideration, why are onion root tip cells used to study mitosis? Onion root tips are commonly used to study mitosis. They are sites of rapid growth, so the cells are dividing …

2.Mitosis in Onion Root Tips (Theory) : Cell biology Virtual …

Url:https://vlab.amrita.edu/index.php?brch=188&cnt=1&sim=1102&sub=3

25 hours ago It is because of the meristematic cells that are situated in the tip of the roots that render the most desirable and suitable raw material to study the different stages of mitosis. Onion is a monocot …

3.Onion Root Tip Mitosis - Stages, Experiment and Results

Url:https://www.microscopemaster.com/onion-root-tip-mitosis.html

9 hours ago Cell division occurs rapidly in growing root tips of sprouting seeds or bulbs. The most commonly used root tips in labs to study mitosis are onion, wheat, lentil, barley and alfalfa. An onion root …

4.Why are onion root tips used to study mitosis? - Quora

Url:https://www.quora.com/Why-are-onion-root-tips-used-to-study-mitosis

8 hours ago Results. An onion has a total of 8 pairs of chromosomes. This is especially beneficial for this experiment given that fewer chromosomes are slightly easier to see when they condense. As …

5.Onion root lab Flashcards | Quizlet

Url:https://quizlet.com/433383168/onion-root-lab-flash-cards/

6 hours ago Why is onion root tip used to demonstrate mitosis in this experiment? It is because of the meristematic cells that are situated in the tip of the roots that render the most desirable and …

6.Observing Onion Cells Under The Microscope » …

Url:https://www.microscopeclub.com/observing-onion-cells-under-the-microscope/

14 hours ago Onion root tip cells are mashed onto microscope slides to study mitosis because: onion root cells are fairly large The root tip is growing rapidly; and gives cells with different visible stages of …

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