they are 6 question about mitosis they are so sample aslo i attached other phot thats will help u to solve this questionsExercise 12: Mitosis
• Instructions:
• Complete and submit this worksheet to get credit (25pts)
• I’m asking that you submit this on Canvas as an uploaded file. That
means you should type the answers in a separate document (word or
power point are good). Then upload that file on Canvas to submit it.
• There is a power point on Canvas which contains some background
information on this exercise. Also there is information on pg 183 of
your lab manual that you will find useful for this exercise.
Name:____________________________
Exercise 12: Mitosis
ACTIVITY 1: Draw, Label And Describe The Important Parts Of Mitosis
1)Interphase: ______________________________________
Description Of What Happens In This Phase
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Name:____________________________
Exercise 12: Mitosis
ACTIVITY 1: Draw, Label And Describe The Important Parts Of Mitosis
2) Prophase: ______________________________________
Description Of What Happens In This Phase
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3) Metaphase: ______________________________________
Description Of What Happens In This Phase
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4) Anaphase: ______________________________________
Description Of What Happens In This Phase
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5) Telophase: ______________________________________
Description Of What Happens In This Phase
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6) What is the process of splitting of the cell called?______________________________________
1) The cell at the start of mitosis is called the _____________cell
2) After mitosis the two new cells are called_____________ cells
3) At the start of mitosis is the cell haploid or diploid?
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4) After mitosis are the cells haploid or diploid?
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5) Are cells after mitosis are genetically identical or different?
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6) Are the cells after mitosis genetically identical or different
compared to the parent cell?
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Exercise 12: Introduction to Genetics and Cell Division
The
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The purpose of this part of the exercise is to get some hands on time learning the steps in
mitosis. This is a process best learned by working with actual chromosome models. Once you are
familiar with the various phases, you will then examine some real cells and make some estimates
of the amount of time that is spent in each phase of the cell cycle.
Part 1: Mitosis Simulation
In this part of the lab, you will be doing a simulation of the steps in the mitosis process. Use the
pipe cleaners in the lab and the paper sheets with each of the stages of mitosis to describe the
various phases. You should go through the process with one homologous pair of chromosomes
first, and then repeat the process with two homologous pairs. Start with phase G1, and then
describe what happens in S, G2 and each of the phases of mitosis. Use your textbook to help you
work through the stages. Be sure to include the following information in your description of the
process:
Interphase
Prophase
Metaphase
G1: Cell grows, performs normal functions
S: DNA is replicated; sister chromatids remain joined at the centromere
G2: Cell stockpiles molecules required to complete the division process
DNA in the form of chromatin begins to condense into visible chromosomes
Nuclear membrane begins to disintegrate
Spindle fibers begin to form, originating at poles of the cell and joined to each sister
chromatid at the centromere
By the end of prophase, DNA is fully condensed and spindle fibers are formed
Chromosomes are pulled by the spindle fibers and aligned across the equator of the
cell (metaphase plate)
sister chromatids are separated at the centromere and pulled to opposite poles of
the cell by spindle fibers
Chromosomes are enclosed in a new nuclear membrane; spindle fibers break down,
DNA in chromosomes returns to chromatin form
The cytoplasm of the cell divides in half
in plant cells, a cell plate form, dividing the cell in two
in animal cells, a cleavage furrow forms and pinches the cell into two
End result is two, genetically identical daughter cells
Anaphase
Telophase
Cytokinesis
When you think you understand the steps in the process and can describe them completely, call
you instructor to test your knowledge. You will be required to explain each of the steps listed
above using the pipe cleaners and paper. This oral exam will be part of your grade for this lab.
Part 2: Cell Cycle Time Estimation
In a population of cells that are actively growing and dividing, only some of the cells are actually
in mitosis at any one time. The percentage of dividing cells is known as the mitotic index. The
approximate duration of the various stages of mitosis can be obtained simply by multiplying the
mitotic index by the total duration of the cell cycle. You will determine both the mitotic index and
duration of mitosis in Allium root tips.
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