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Onion root tip under microscope

Onion root tip mitosis experiment - This video is going to show you a Onion root tip mitosis experiment with all the details when we put a Onion root tip mit.. Title: Onion Root Tip Under Microscope. Objective(s): Observe all stages of mitosis and the cell cycle. Hypothesis: The interphase stage will be more likely to be spotted than the other stages because it is the longest stage

Onion root tip mitosis experiment under microscope - YouTub

Solved Cell Division Worksheet 1 Microscope Images Type. A Closer Look Inside Botany The Huntington. Onion Cells Under The Microscope Requirements Preparation And. Solved 76 Exercise 9 Mitosis Materials Prepared Slides O. Mitosis Or Cell Division In A Plantmetaphase Onion Root Tip 500x As mentioned, onion root tip cells divide rapidly as the roots elongate to absorb water and various minerals from the soil. For this reason, it's possible to identify different stages of cell division by mitosis based on chromosomal distribution. When viewed under the microscope, a properly prepared slide will yield the following results

Sample assignment on Onion Root Tip Under Microscop

Add a drop of iodine solution on the onion membrane (or methylene blue) Gently lay a microscopic cover slip on the membrane and press it down gently using a needle to remove air bubbles. Touch a blotting paper on one side of the slide to drain excess iodine/water solution, Place the slide on the microscope stage under low power to observe Sample answer: In this lab, I am using photographs taken of onion root tips under the microscope. I am Identifying the stages of the cell cycle that individual cells are in. The number of cells in each stage will be used to estimate the length of time that cells spend in each phase. Assuming a cell cycle length of 24 hours, the time that a cell. Cytokinesis Onion Root Tip Labeled. Onion Root Mitosis Metaphase Mitosis Microbiology Biology. Plant Mitosis All Phases Onion Root Tip 200x At 35mm Interphase. Https Www Lachsa Net Ourpages Auto 2017 1 23 60294137 Chapter 208 20packet Mitosis 20lab Pdf. Mitosis Ms Whitaker 8th Grade Physical Science 1). Karen is looking at a slide of an onion root tip under a microscope. She noticed that not all the cells look the same. Which of these best describes why all the cells are not identical? A). The root is continuing to grow so the cells are going through mitosis B). Some of the cells are cells and others are cells in the stem C)

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 onion root cells when demonstrating how cell division takes place in Onions have larger chromosomes than most plants and stain dark. The chromosomes are easily observed through a compound light microscope. The cells pictured below are located in th

Onion Root Tip Cell Under Microscope Labeled - Micropedi

Not all cells can be stained with iodine, but onion cells take it up nicely so that there is contrast under the microscope. Onion - Peeled to one layer. If it's any thicker, you won't be able to see through it under the microscope. Microscope - A simple light microscope will be sufficient Onion Root Images Images of Onion Root Tips In class, we viewed cells under the microscope to identify cells that were in various stages of the cell cycle. If you missed the lab, these images can be used to make-up the lab worksheet The photomicrograph below depicts onion root tip cell chromosomes in metaphase, ready for separation. The kinetochore and polar microtubules are clearly visible and radiate out the ends of the cell leaving the chromosomes in the middle of the complex 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

The onion root tip cells' slide is now prepared and ready to be examined for different stages of mitosis Observe and study mitosis by placing the slide under the compound microscope. Focus as desired to obtain a distinct and clear image The next thing we did, was we applied the things we learned through the online projects to onion root tips. We looked at them under a microscope and collected data by looking at a group of cells, and counting up the amount of cells in each phase. Here is a pie graph to represent this data

Hands-on—seeing is believing. There's nothing like seeing the steps of cell mitosis to make an impression on students. Stained with hematoxylin and selected to show all stages of mitosis, these onion root tip slides make the process clearly visible. No wonder they're best sellers! Allium. Roots tips selected to show all stages of mitosis Each stage of mitosis takes different amount of time, and while the observation of a complete cell cycle (24 hours) under a microscope is impossible, scientists can get a idea of the time spent in each stage by studying an onion root cell, and counting how many cells within the onion root are in each stage, thus creating an average percentage of cells per phase This video covers informaiton to help you identify cells in different stages of mitosis and the cell cycle when observing an onion root tip under a compound. Photo about Root tip of Onion and Mitosis cell in the Root tip of Onion under a microscope. Image of haploid, meiosis, cytokinesis - 17850662 A bove is an onion root tip observed under a microscope. In the data table shown below, count the number of cells in each phase of mitosis. Combine prophase and prometaphase

2) Onion Root Microscopy. Using the Virtual Microscope you explored in the activity earlier today, find the onion root tip slide. From the slide box, select Plant Slides, and then Onion Root.. Once again, zoom in and focus on the slide until you are using the 40x objective lens. This gives you an idea what this would look like. Mitosis occurs in four phases: prophase, metaphase, anaphase, and telophase. In this lab, you will determine the relative length of time each phase of mitosis takes in the meristem of an onion root tip on a prepared slide. This will be determined by observing the onion root tip under the microscope and counting the number of cells in each phase

When observing the onion root tip cells for the stage of prophase, the cells took on a brick-like structure and within the cells, small dots (the nuclei) can be seen. In one particular cell's nucleus, the chromatin has condensed so much that it can be seen using a light microscope. The stage that the cell is currently in is prophase 2. Again, rinse the root tips 3 times with water. Preparing the root tip squash. 1. Transfer a root to the center of a clean microscope slide and add a drop of water. 2. Using a razor blade cut off most of the unstained part of the root, and discard it. Cover the root tip with a cover slip, and then carefully push down on the cover slide with th Photo about Root tip of Onion and Mitosis cell in the Root tip of Onion under a microscope. Image of microscopic, centromeres, cytoplasmic - 13411170 placed on a slide. Using a scallop, every part of the onion root was cut off and trashed but the very tip. The root tip was covered for two minutes with Toluidine blue and blotted with a paper towel. Then, a drop of water covered it and a cover slip was pressed on. The slide was then placed on the microscope. Area Z was then located on low power 2. Obtain a prepared slide of an onion root tip. Hold the slide up to the light to see the pointed ends of the root sections. This is where the cells were actively dividing. 3. Place the slide on the microscope stage with the root tips pointing away from you. Using the low power objective, find the root tip and focus it with the coarse.

Onion Root Tip Mitosis - Stages, Experiment and Result

  1. This preparation of onion root tip cells is now ready for the study of mitosis. Place the slide under the compound microscope and observe the different stages of mitosis. Various stages of mitosis are prophase, metaphase, anaphase and telophase. Simulator Procedure (as performed through the Online Labs
  2. Onion Root Tip, l.s, Thin Microscope Slide, : Microscope Sample Slides: Amazon.com: Industrial & Scientifi
  3. The student will correctly identify and draw four stages of mitosis using microscope slide images of onion root tips and whitefish blastulae. Procedure: The slides below show longitudinal sections of allium (onion) root tip. Because growth in roots occurs at the tips, this is where cells will most actively undergo mitosis
  4. Observe the image of an onion root tip microscope slide. Identify cells which represent each phase of the cell cycle. Count as many identifiable cells as possible, and record your data in the Table. Question: Observe the image of an onion root tip microscope slide. Identify cells which represent each phase of the cell cycle
  5. Mitosis Lab. On November 8, 2013. November 12, 2013. By nrossi In Investigations. In my AP Biology class, I observed dividing onion root tip cells through a light microscope to see the phases of mitosis that the cells were in and calculate the length of time the cells spend in each phase of mitosis. Below is the lab format. Page 1
  6. g's solution. It shows portions ol three resting cells with their nuclei. Magnification = 4500 x. Fig. 2. A section fixed in neutral formalin showing practically all of two resting cells and parts of several others

Onion Cells Under a Microscope - Requirements/Preparation

Procedure: Take a Microscope slide with the Onion Root Tips on it and place it under a Microscope. Focus as much as you can on the Onion Root and see the different cells. Notice that the cells are in different stages of mitosis. Count how many are in each stage and then make a pie chart to show this data The root tip should spread out to a diameter of about 0.5- 1cm. Observe it under a compound microscope in 10x objective. Scan and narrow down to a region containing dividing cells and switch to 40x for a better view. An Alternative Procedure . Cut the tip 5 to 8 mm from the tip of the freshly sprouted root. Discard the rest of the root

Answer Key: Onion Root Tip Lab - Flipswitc

  1. If you have a microscope (400x) and a properly stained slide of the Onion root tip (or Allium root tip), you can see the phases in different cells, frozen in time. You will be looking at strands of DNA inside the cell! Note: The onion root tip slide is included free in your slide kit when you purchase a microscope from Microscope World
  2. ute
  3. ed under a microscope, and the total number of cells present in each viewing, as well as the number of cells in each stage will be recorded
  4. Prepared microscope slide of Onion (Allium cepa), root tip for plant mitosis, LS, haematoxylin and orange g stai
  5. a microscope slide. a cover slip. First, place a small drop of water on a microscope slide. This is to hold the onion skin and to keep it from drying out. Cut the onion into sections. Take a piece from on of the sections and peel off a small, thin piece of the onion epidermis, or skin. Using tweezers, place the onion skin onto the drop of water.
  6. To obtain these images, the onion root tip was cut off, stained and put on a microscope slide. A cover slip was placed on top. The root tip was then firmly squashed and viewed under an optical microscope. (b) Complete the table below to give one reason why each of these steps was necessary. 1. Taking cells from the root tip 2
  7. Download this Root Tip Of Onion And Mitosis Cell In The Root Tip Of Onion Under A Microscope video now. And search more of iStock's library of royalty-free stock video footage that features Advice video available for quick and easy download
Onion root tip cells stock image

preparation of onion root tips cells is now ready for the study of mitosis. Study of slide Place the slide on the stage of a good quality compound microscope. First observe it under the lower magnification (10 X objective) to search for the area having a few dividing cells. Examine the dividing cells under highe In Mr. Wong's 7th period bio-honors class, we did a lab experiment on the processes of mitosis and the different phases as seen under a microscope. The objective of this experiment was to calculate the percentage of cells in each of the phases of mitosis.There were two different slides, one of onion root tip and one of whitefish blastula Observation of Mitosis Stages In Onion Root tip. Root tips 1 to 2 cm was cut and incubated in Carnoy's fixative for 15 to 20 minutes. Then washed thoroughly in water 2 to 3 times. The root tips was transfered in 1N Hydrochloric acid and incubate at 60°C for 5 minutes. Stained with acetocarmine for 10 minutes

Light micrograph (LM) of a transverse section of onion (Allium cepa) root tip to show cells undergoing mitosis (nuclear division). Magnification: x100 when printed at 10 centimetres wide. Purple onion peel under the microscope Onion skin in cross section (microscope. Method: -Pick a onion root tip slide from the box and place in under your microscope. -Adjust lens until each individual cell is visible. -Focus in on the tip of the onion root, but the very tip because this contains dead cells and using those will not obtain the right data. -Count vertically in the middle and horizontally down the middle to. The materials necessary for this exercise are a light microscope, prepared slides of whitefish blastula, onion root cell tips, a pencil, and paper. Methods: Exercise 3A.1: Observing Mitosis During this exercise, prepared slides of whitefish blastula and onion root tips should be observed under the 10X and 40X objectives of a light microscope Obtain a prepared slide of onion root tip cells (plant cell) from the front of the room. ***Remember to start under low power, then move to medium and high power.*** In your field of view, determine the phases that 36 cells are in and record your data in th Biology questions and answers. Very important: You should be able to identify the different stages (shown under microscope) of cell cycle/mitosis in an onion root tip and whitefish blastula. Metaphase Anaphase o Telophase Anaphase eo. Question: Very important: You should be able to identify the different stages (shown under microscope) of cell.

Interphase Under Microscope Onion Root Tip - Micropedi

Remember that mitosis in an onion root tip normally takes about 80 minutes at room temperature. Calculate the amount of time each stage takes by mutiplying the percentage of cells in a stage by 80 minutes. Record your answers in the DATA TABLE. For example: If there were 8 percent of the cells in metaphase, then 8 percent of 80 minutes would be. Onion plant with root, acetocarmine stain, 1 N HCl, Scissors, Forceps, Razor blade, Microscopic slides and cover slips, Water bath, Light Microscope. Procedure 1. Cut the tip 5 to 8 mm from the tip of the freshly sprouted root. Discard the rest of the root. 2. Wash them in water on a clean microscope slide. 3. Place one drop of 1N HCL on the.

1). Karen is looking at a slide of an onion root tip under ..

The Onion Mitosis BioKit® includes everything that you need to prepare onion root tips slides. Students stain the root tips, prepare squashes, and observe mitotic phases. The entire exercise can be completed in 1 lab period. Price. $87.00 United Scientific Supplies 500-20Onion Root Tip Mitosis Prepared Microscope Slide. 4.4 out of 5 stars 8. $5.54 $ 5. 54. Get it as soon as Thu, May 6. FREE Shipping on orders over $25 shipped by Amazon. More Buying Choices $4.97 (2 new offers) Prepared Onion Root Tips Cell Mitosis Slides, Clearly Show Plant Cell Mitosis All Stages Onion Root Tip Under Microscope Sample Assignment. Observing Mitosis Through Onion Root Tips In class, we recently conducted this lab to take what we have been learning about the cell life cycle, Mitosis, and study it even further and deepen our level of understanding of this topic! This lab required the class to break out the microscopes, work. Microscope; Allium onion root tip slide; Method: Set up the slide of the onion root tip under the microscope, with the tips pointing away. Start observing one root tip at a time, since there are three tips on one slide. Focus the slide with the smallest magnification

Observing Onion Cells Under The Microscope » Microscope Clu

  1. Name: _____ Period: _____ Date: _____ Mitosis Under the Microscope Part A: Nucleus Analysis of Onion Root Tip Cells 1. Interphase a. Put a red diamond around 1 cell in interphase 2. Mitosis: a. Put a green square around 1 cell in prophase b. Put a blue circle O around 1 cell in metaphase c. Put a brown triangle around 1 cell in anaphase d
  2. This process is called Mitosis and there are four distinct stages. In the drawings below, you can see the chromosomes in the nucleus going through the process of mitosis, or division. If you have a microscope (400x) and a properly stained slide of the onion root tip (or allium root tip), you can see the phases in different cells, frozen in time
  3. e technique. And observe under microscope. Acetocar
  4. In this activity, students will analyze a picture of onion root tip cells from under the microscope (no microscopes needed!) Students will identify which phases the cells are in, calculate the percentage of cells in each phase, and answer questions. Included in your purchase is a printable PDF vers

Onion Root Mitosis - Microscopy-U

How to Observe Onion Cells under a Microscope - Blog, She

The root tips of onion plants are commonly used for observing cell division because: The onion plants are easy to grow in large numbers. The cells at the tip of the onion roots are actively dividing, so many of the cells will be in stages of mitosis. The root tips can be prepared in a way that allows them to be flattened on the microscope slide. Microscope Investigation: In this next exercise, you will navigate to this website and zoom in on parts of an onion root tip to see cells at various stages of the cell cycle as you would see them under the microscope. Start by clicking on the white magnifying glass at the bottom of the screen (not the one on the left) to zoom in When observing the onion root tip cells for the stage of prophase, the cells took on a brick-like structure and within the cells, small dots (the nuclei) can be seen Onion root tip mitosis lab worksheet answers. In one particular cell's nucleus, the chromatin has condensed so much that it can be seen using a light microscope. The stage that the A student is examining an onion root tip cell under a microscope. Based on her observations, the student proposes that the onion root tip cell has completed interphase and is now in the first phase of mitosis 3. Cover the root tip with a cover slip, and then carefully push down on the cover slide with the wooden end of a dissecting probe. Push hard, but do not twist or push the cover slide sideways. The root tip should spread out to a diameter about 0.5 - 1 cm. Observations of onion root tip squash. Scan the microscope under the 10x objective

Images of Onion Root Tips - The Biology Corne

  1. Buy Microscope Slide: Allium (Onion) - Root Tip - Cross Section and Longitudinal Section, SL10118 at Nasco. You will find a unique blend of products for Arts & Crafts, Education, Healthcare, Agriculture, and more
  2. Observing Cell Division - Looking at Onion Root under the Microscope p. 47 Answers a) Onion root tip (and whitefish embryos) are used because these tissues are growing fast and will have lots of mitosis occurring. It is easy for us to find cells dividing here. b) You should notice that rapidly dividing cells are smaller than non-dividing cell
  3. e cells in the tip of an onion root, a thin slice of the root is placed onto a microscope slide and stained so the chromosomes will be visible. Draw the cell plate if it is visible. For example, the cells at the tip of an onion root are rapidly dividing to extend the root tip deeper into the soil during plant growth

This lab involved looking at two areas of a prepared slide of onion root tip tissue under a microscope to count the number of cells undergoing mitosis. A count was made of cells under the microscope for each region and the appearance of each cell was compared with the illustrations in the textbook s Obtain a prepared slide of onion root tip cells from the front of the room. Get out your microscope and bring your slide into focus. ***Remember to start under low power, then move to medium and high power.*** In your field of view, determine the phases that 36 cells are in and record your data in table on the following page. Repeat this process Microscope; Procedure. Return to the slide of the onion root tip. Using correct microscope procedure, observe an onion root tip under high power (400X). Choose ONE view and then carefully COUNT the number of cells in each stage of the cell cycle. Feel free to estimate the total number of cells in each stage. Dat Onion Root Tip magnified by 100 microns Saved by Dukepope (Bård Sandemose) Fashion Show Themes Microscopic Images Work Pictures Plant Cell Things Under A Microscope Circle Of Life Transportation Design Skin Art Small Worl

Onion Root Tip (Mitosis) Prepared Microscope Slide

Molecular Expressions Photo Gallery: Mitosi

  1. utes. Add a coverslip and blot with filter paper. View under a microscope and identify the stages of mitosis
  2. Set up a slide of an onion root tip under a microscope with x.65 magnification. 2. Focus on a segment of the cell slightly above the tip of the root, and count the number of cells total in the segment. 3. Using the visual cues identified in the introduction, count the number of cells in each phase of the cell cycle (interphase, prophase.
  3. e a slide of a stained onion root tip under a microscope. Viewing the slide under low power, adjust the stage until you find the boxlike cells just above the root tip. (see the diagram to the right) 2. Switch the microscope to a high power and locate cells that are in the process of dividing. 3

Cell division (mitosis) in the apical meristem of onion root tips. The apical meristem is the quickly growing part of the roots and shoots of plants. It is an ideal place to observe many dividing cells. The zoom image shows two onion root tips. Try to find the different stages of mitosis, in which the chromosomes are then clearly visible The phases of onion root tips were observed under a microscope. The crossing-over of chromosomes in meiosis was observed by viewing photos. Hypothesis If looking under a 400 power microscope, than it is possible to observe mitosis occurring in whitefish blastula and onion root tips When you look at the onion cells under the microscope you can see the different phases of mitosis going on and the slide of . The one thing I found - the root tips are only in the various stages of mitosis at certain times of the day. in plants = zone of cell division just behind root cap, seen in onion root tips Data and Observations. In this lab, you will examine cells from onion root tissue. Root-tips are regions of active cell division. It is very likely to observe every stage of cell division in root tips. You will examine onion root cells under the microscope and identify the different stages of cell division in the tissue sample. You will also determine ho - Microscope - Prepared slide of onion root tip PROCEDURE 1. Obtain prepared slide of onion root tip. 2. With the microscope, examine the onion root tip under low power to find cells in various stages of the cell cycle. After you have located the various stages of the cell cycle under low power, switch to medium power and refocus microscope

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

Left: Microscopic view of an onion skin showing several rectangular cells, each with a small, spherical nucleus (red arrow). The slide was stained with a drop of yellowish-brown gram's iodine. Right: Highly magnified view of a cell from the meristematic root tip of an onion showing enlarged nucleus containing 16 chromosomes. The cell is in prophase of mitosis, with distinct chromosomes. Under high-power lens, onion root tip appear as large, rectangular interlocking cells. It is clearly visible that cells are surrounded by distinct cell walls. Each cell has a dark stained nucleus. Large vacuoles are also observed in the cells. Small starch granules are also present inside the cells within the cytoplasm To obtain these images, the onion root tip was cut off, stained and put on a microscope slide. A cover slip was placed on top. The root tip was then firmly squashed and viewed under an optical microscope. (b) Complete the table below to give . one

Video: Study Of Mitosis In Onion Root Tip Cells - Cell Division

The Biology Project > Cell Biology > Intro to Onion Root Tips Activity > Activity Online Onion Root Tips. Determining time spent in different phases of the cell cycle The life cycle of the cell is typically divided into 5 major phases. The phases are listed below, along with the major events that occur during each phase In order to examine cells in the tip of an onion root, a thin slice of the root is placed onto a microscope slide and stained so the chromosomes will be visible. High school, college/university, master's or phd, and we will assign you a writer who can satisfactorily meet your professor's expectations Carefully use the razor or scalpel to trim the root tips to 2 mm long, keeping the tips. Use needles or pins to carefully slice the root tips into 2 or more length-wise sections. Doing this work with a magnifying lens or under a dissecting microscope may be helpful. Use a pipette to coat the dissected root tips in Toluidine blue

Onion Root Tips Mitosis Mandi & Biolog

Onion Mitosis Root Tip Microscope Slides Carolina

While looking at prepared slides of onion root tip cells and whitefish blastula cells under a microscope I will be able to identify and draw the stages of mitosis in these cells. Materials The materials used in this experiment were a light microscope and prepared slides of onion root tip cells and whitefish blastula cells. Method Abstract. A series of electron micrographs has been made of thinly sectioned onion root tip fixed with several types of fixative and embedded in methacrylate. With acid fixation the cellular protoplasm appears shredded at these high magnifications, but after neutral fixation the cellular contents form continuous networks that indicate a better. root end of onions are visible under a microscope. Since this part of the onion root nozzle cells was selected randomly, these cells can give an example of the whole root tip. Each cell at the root end of the onion progresses at a similar rate to the rest of the cell cycle, since the entire region consists of meristem tissue 1. Prepare a slide of stained chromosomes using the squash technique. 2. Identify the stages of mitosis from prepared stained slides of onion root tips seen under the compound microscope. 3. Identify the structures visible under the compound microscope of cells in various stages of cell division

Actively growing onion root tips are required for this activity. Allow at least 2-4 days for new roots to grow. To grow root tips, obtain 5-6 onion bulbs or green onions. Remove any dried, old root growth from the bottom of the bulbs. Place each onion bulb into a plastic cup or jar of water so that only the root portion of the bulb is under. This exercise uses onion root tips to illustrate the amount of time spent in each phase of mitosis. Work as a team to look at onion root tips under the microscope. This area of the root is undergoing rapid cell reproduction. Identify the phases of the cell cycle for 20 randomly chosen cells. Record this information in the table

Root Tip Of Onion And Mitosis Cell In The Root Tip OfPlant Mitosis Anaphase Onion Are Visible Stock PhotoMetaphase Mitosis Onion Root Tip Shows ReplicatedNew Page 1 [ez002Mitosis lab Onion Root TipMitosis in Onion Root Tip Prophase (black) MetaphaseMitosis Videos

Take a clean slide, put a drop of acetocamine on it. Transfer the salivary glands in acetocarmine on slide and cover it with a cover-slip. Leave it for 10 minutes and then warm it gently. Adopt squash technique as described in case of onion root tip. Observe the slide under microscope and for details observe under high power of microscope. Equipment and Materials: Compound Microscope Laptops Prepared Slide of Onion (Allium) Root Tips Prepared Slide of Whitefish Mitosis BC Science 9 Text pg. 162-163 Part 1-Plant Cells Procedure: 1. Take a prepared slide of an onion tip root and observe it under low power.. Set up a compound light microscope and turn on the light. Place a slide containing a stained preparation of the Allium (onion root tip) or Whitefish blastula. Locate the meristematic or growth zone, which is just above the root cap at the very end of the tip or. Focus in on low power, and then switch to medium or high power Mitosis internet lesson onion root tip classification 20 10 3 2 1 56 28 8 6 2 prelab: This preparation of onion root tip cells is now ready for the study of mitosis. Onion root tip mitosis refers to a type of cell division where the parent cell produces two identical daughter cells resulting in two diploid daughter cells Onion Root Tip Mitosis Lab. USE OF ONION ROOT TIPS FOR MITOTIC DIVISION OBSERVATIONS Introduction The zone of cell division on the onion root tip is a great place to observe mitotic cell divisions. Through the observation and comparison of different regions of the root tip, the duration of mitotic stages and mitotic indexes are determined for the various divisions of the root tip