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

To investigate the effect of varying phases of mitosis on the duration of each of the phases by measuring the percentage number of cells

Extracts from this document...


Name: Nguyen Hong Hanh Class : 5X 1. Aim To investigate the effect of varying phases of mitosis on the duration of each of the phases by measuring the percentage number of cells 2. Introduction Mitosis is a form of nuclear division. It refers to the division of the nucleus that produces two daughter nuclei, each containing an identical set of chromosomes. It is also described as replicative division. During the process, the chromosomes in their replicated state; are precisely separated and their chromatids distributed one to each daughter nucleus. The process can be divided into four phases. These phases vary in terms of their duration. In a tissue where the cells are actively dividing, cells in different phases of mitosis can be easily observed. It can be assumed that when many cells are observed to be at a particular phase, that phase occurs over a long period and vice versa. Hypothesis -The percentage number of cells in prophase is highest while the percentage number of cells in anaphase is lowest. In other words, prophase takes the longest time while anaphase takes the shortest time in mitosis of two roots. ...read more.


75.0 74.3 63.3 44.0 71.7 70.4 4.8 Metaphase 11.3 6.3 14.3 18.3 32.0 18.9 15.7 3.6 Anaphase 5.7 12.5 2.8 6.7 6.0 5.6 5.4 1.5 Telophase 15.1 6.3 8.6 11.7 18.0 3.8 10.6 5.4 Showing calculations Percentage number of cells for all the samples = [one phase/ ? phases] x 100 Average percentage number of cells = (? percentage number of cells)/(number of samples) 6. Discussion and result Anomalous results There were 6 anomalous readings in the data collected. There are highlighted in tables 3 and 4. Their values differ greatly from those of other replicates. They also clearly do not conform to the trends shown by the values obtained in the other replicates. As a result, they have been excluded when calculating the average percentage change in mass and standard deviation. Results of investigation As shown by the values in table 3 and table 4, there was the largest percentage number of cells at prophase and the lowest percentage number of cells at anaphase. The range of prophase from 56.2% to 70.4% while the range of anaphase from 4.7% to 5.4%. Because many cells are observed to be at particular phase, that phase occurs over a long period of time and vice versa. ...read more.


Conclusion -The percentage number of cells in prophase is highest in four phases and the percentage number of cells in anaphase is lowest in four phases of two roots in mitosis. Hence, prophase takes the longest time and anaphase takes the shortest time in mitosis. This agrees with the hypothesis proposed for the investigation. 8. Evaluation There are various weaknesses and limitations observed in the investigation. They are summarized in the following table together with suggestions for their improvements. Limitation/weakness Evaluation of limitation/weakness Suggestion for improvement Some of cells may be washed away along the process Some of cells may be washed away the chromosomes which is used to recognize the cell in which phase during preparing the root tip slide because the slide is cut very thin and stained with color Repeat the experiment with different slides of each root tip to take the average to minimize the random error when the chromosomes washed away. The area of observation is narrow Select an area of at least 50 dividing cells in the root tips, leading to obtain a significant difference in the number of cells in each stage The area need to be widened to at least 100 or 150 cells. 9. ...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. Osmosis Experiment. This experiment is to consider how salinity influences osmosis in potato cells.

    Average difference (+0.001g) Standard deviation 0 0.095 0.022 0.2 0.027 0.01 0.4 -0.035 0.026 0.6 -0.054 0.046 0.8 -0.093 0.041 This table shows the average difference and standard deviation for each salt concentration investigation. 2.3.2 GRAPH 1: Results Graph This graph shows the average mass of potato cubes after osmosis.

  2. Ecology Open Investigation Does the geographic location affect the biotic and abiotic ...

    The collector should take sample data in front of them Different methods of collecting the sample Some collectors walked out into the site and collected the experiment in front, at the back or surrounding them. Some collectors stomped on the ground before collecting biotic data.

  1. In this extended essay I am looking at the effect of different kind of ...

    It is a lengthy process, though. How music affects plant growth, cannot be observed within days of the plant being exposed to music. It takes few weeks to identify the effects of music on plants. Now talking about Chickpea, it is also known as gram seeds. This is an angiosperm.

  2. The effect of toliet cleaning products on E-coli ...

    Gloves will be worn to prevent contact contamination, the lids of the agar plates shall be kept sealed whenever possible, additionally the experimenter should keep their face as far from the sample as possible to avoid oral contamination. Atmosphere of growing conditions Controlled variable Samples shall be placed into an incubator keeps temperature and humidly at a constant level.

  1. Allelopathy. Open Investigation Will increasing the number of allelopathic sunflower plants effect the ...

    height of the plant The location where the plants are left to grow The pots will be left in an undisturbed location where plants are able to attain full sunlight in the day. Prevent the interference of pests with the plant All plants will be inspected daily.

  2. The effect of pvc piping on the breathing/heart rates of male year 12 students

    for one minute and then recorded as beats per minute, this will be compared against the control of regular breathing. Breathing rate Dependent variable After being induced under pipe breathing for 30 seconds the subject's rate of breath (full inhalation vs.

  1. Comparing the effect of different antimicrobials on the growth of E.coli

    9.5 10.8 12.2 13.3 16.7 19.0 - As seen from Table 1, different antibiotics have a different strength of inhibiting the growth of the bacterial culture of Escherichia coli. It also clearly portrays the assumption that the concentration of the substance is in a linear relationship with the diameter of the corresponding zone of inhibition.

  2. How will changing the percentage of glucose concentration affect the light transmission percentage from ...

    The glucose to water ratio/ concentration percentage will be as follows: 2ml: 8ml = 20% 4ml: 6ml = 40% 6ml: 8ml = 60% 8ml: 10ml = 80% 10ml: 0ml =100% Independent variable Dependent variable Variable measured Method of measuring variable Dependent variable Light transmission (%)

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