• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Mitosis Lab report

Extracts from this document...

Introduction

Mitosis Faris Al-Ahmadi 18th October, 2010 Data Collection Table with 100 cells recorded in an onion root tip to show which stage of mitosis each cell is in Cell Phase Number of cells (� 5 cells) * Interphase (phase before mitosis) 43 Prophase 20 Metaphase 12 Anaphase 10 Telophase 15 Table with 100 cells recorded in a different onion root tip region to show which stage of mitosis each cell is in Cell Phase Number of cells (� 5 cells) * Interphase (phase before mitosis) 36 Prophase 18 Metaphase 13 Anaphase 12 Telophase 21 *These uncertainties are an estimated non-systematic (human) error during the practical. Data Processing Graphs = � 5 Cell Error Margin Objectives: 1. Describe the events occurring in each stage of mitosis emphasizing the movement of chromosomes. Prophase: This phase is the first phase in mitosis. In prophase, chromatids formed from interphase are starting to be shown as chromosomes, since they are shortening and thickening, making them more visible to a microscope. Each chromosome contains two sister chromatids, joined together by a centromere. The nuclear membrane of the nucleus starts to disappear, and so does the nucleolus. Centrioles in the cell start to move to either end of the cell, and they stay put at the ends. ...read more.

Middle

added together. Then, that number divided by 200 (Total root tip cells + total area above root tip cells), and then multiplying everything by 100 to give the specific cell percentage time in mitosis. Cytokinesis: This is when the cell actually splits into its daughter cells. The cell spends 0% (no cells shown to be in cytokinesis) of its time in cytokinesis. The literature value for each phase in an onion cell (in the root tip) states that 90% of the time, the cell is spent in interphase. So 10% of the time, the cell is actually dividing (Mitosis + cytokinesis). The mitosis consists of prophase (5%), metaphase (2%), anaphase (0.5%), and telophase (2%). The left over 1% is the cytokinesis. 3. Describe and compare the structure of a late prophase chromosome with an anaphase chromosome. Late Prophase Chromosome Anaphase Chromosome Diagram Diagram Description A late prophase chromosome consists of two identical sister chromatids. These chromatids are connected together by a centromere, which can be located anywhere in-between the chromosome. Description An anaphase chromosome is a single chromatid, which is then called a chromosome. The chromatid has no centromere, since it does not have another chromatid to connect to. ...read more.

Conclusion

It could also mean that the root tip regions was not a good choice for showing cytokinesis, but rather the process (mitosis) leading up to it. A third possibility could have been counting more cells, however, it is a small probability that a cytokinesis cell is recorded, because it is hard to distinguish between an interphase cell or a newly formed daughter cell from cytokinesis. Cytokinesis is just the final split, and to record that is difficult. Improving the investigation: Firstly, it is important to reduce the error made by the person recording the cells. It is essential to put more care into recording, and to count with more care and accuracy, rather than speeding the experiment. This can already contribute to much more accurate results. Another improvement would be to repeat the experiment two or three times, which would increase the precision of the experiment. If the experiment is repeated three times, an average of the three set of results could be taken, making the results more precise. Increasing the number of cells to record would also be helpful to improving the investigation, because that would leave to more accurate results. If a sample of 400 cells was recorded, then the uncertainty of �5 cells would be less effective. Reducing the uncertainty always causes results to be more accurate. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. Marked by a teacher

    Biology: Lab report Germination

    4 star(s)

    Put the lid on. Repeat this for the remaining three Petri dishes. 5. Place on dish in a stove, one in a refrigerator, one in a dark cupboard, and one under a bright lamp. 6. Water all seeds regularly. Control Experiment This is the method for the control experiment.

  2. effect of microwave radiation on lentil seeds lab report

    The graphs both show how at first the mean height and mean number of leaves increased as microwave radiation increased but then dropped when the seed was put under too much radiation. These results are all calculated by taking the plants within these groups which did not show any growth for other reasons into consideration.

  1. COMPARATIVE INVESTIGATION LAB ON LICHENS

    compared to the lichen found on trees that were in sunny areas. 12 45 11 13 29 13 14 36 19 15 43 10 16 61 17 17 39 19 18 65 22 19 53 24 20 81 8 Data processing: Average percentage coverage of lichen on trees found in

  2. Experiment - The amount of cell division in the Allium cepa root tip cell

    Put one drop of water d. Cover the slide 2. Pick an area a little bit above the onion root tip a. The cells at the root tip cannot be seen, so an area higher is picked 3.

  1. The aim of the investigation is to find out how an increase in surrounding ...

    for 2 minutes to wash away the dye from cells damaged by the cork borer. 4) Place one of the beetroot sections into each of the test tubes. Leave for 20 minutes in the water baths. 5) Decant the liquid from each tube, into a clean; labeled test tube ensuring the beetroot disc stays behind.

  2. Botany Lab Report

    - Plants in Palm Canyon (Rainforest Ecosystem): The environment is hot with excess rainfall. The abundance of water can feed plant but can also cause flooding and soil erosion. Plants in rainforest ecosystem grow rapidly and they use up organic material from decomposing animals and plants quickly.

  1. Biology Lab - frequency of cell division in animal and plant cell

    Each stages of mitosis cycle were drawn on the diagram. The actual length, width and the magnification of the cell and the frequency of the mitosis were recorded and calculated on the back of the diagram. At the end, the calculated magnification of the cell was recorded on the bottom right of the diagram.

  2. Sleep is a normal part of human life. Investigate the neurobiological basis of normal ...

    Because humans function best when they sleep at night and act in the daytime. 1. Misconception 4: People need less sleep as they grow older. 1. Older people don?t need less sleep, but they often get less sleep. That?s because the ability to sleep for long periods of time and

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work