Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 16.2, Problem 1CC
Summary Introduction
To describe:
The functions of three types of microtubules.
Introduction:
Microtubule growth and organization is initiated at two centrosomes which are also called microtubule-organizing centers Mitotic spindles are composed of microtubules, which are the major components of the cytoskeleton. Astral, polar and kinetochore microtubules are three types of spindle microtubules.
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Objective: To review the phases of mitosis with the understanding that in a real tissue or a non-synchronized cell culture, different mitotic phases and cells in interphase will be observed at a certain time.
Interphase is the period between mitotic events; all other phases are part of mitosis and their individual probabilities add up to the total probability of seeing cells undergoing mitosis.
Pay attention to the individual probabilities for cells in each phase of the cell cycle.
Problem N° 10
For a certain type of animal tissue, the probability of a randomly selected cell being in a particular stage of the interphase/mitosis cycle is given by the following table:
Stage
Probability
Interphase
0.5
Prophase
0.1
Metaphase
0.05
Anaphase
0.2
Telophase
0.15
Suppose you examine 100 cells at random from this tissue.
A) How many cells do you expect to see in metaphase? _____ cells
B) You have selected a high magnification (2000 X) in your…
Cell Cycle: Mitosis
The Cell Cycle and M
Mitosis Worksheet
The diagram below shows six cells in various phases of the cell cvcle. Note the cells are not arranged in
the order in which mitosis occurs
. Use the diagram to
answer questions 1-5
Phases of the Cell Cycle
A
B
How can you tell which diagram(s) is/are the end of the cell division?
What are structures seen inside the nucleus?
Are the cells depicted plant or animal cells? Explain your answer.
4. Use the diagram, at the bottom of your answer sheet, draw the phases/
stages of the cell cycle and arrange them in a correct sequence.
5. Why is mitosis important? Give at least 2 reasons.
37:09 / 38:01
5224
Answer as directed:
Identify, define and describe each of the following terms:
a. homologue
b. spindle fiber
c. crossing over
d. interkinesis
Chapter 16 Solutions
Biology
Ch. 16.1 - Researchers usually treat cells with drugs that...Ch. 16.1 - Which phases make up interphase?Ch. 16.1 - Prob. 1CSCh. 16.1 - Prob. 1EQCh. 16.1 - The Eukaryotic Cell Cycle CoreSKILL What...Ch. 16.1 - Prob. 3EQCh. 16.2 - Prob. 1CCCh. 16.2 - Mitotic Cell Division Concept Check: What are the...Ch. 16.3 - Core Skill: Modeling The goal of this modeling...Ch. 16.4 - Sexual Reproduction Concept Check: What is the...
Ch. 16.5 - Variation in Chromosome Structure and Number...Ch. 16 - Prob. 1TYCh. 16 - Prob. 2TYCh. 16 - Prob. 3TYCh. 16 - Prob. 4TYCh. 16 - Prob. 5TYCh. 16 - Which of the following is not an event of anaphase...Ch. 16 - Prob. 7TYCh. 16 - Which of the following statements accurately...Ch. 16 - Prob. 9TYCh. 16 - Aneuploidy may be the result of a. duplication of...Ch. 16 - Prob. 1CQCh. 16 - Prob. 2CQCh. 16 - Prob. 3CQCh. 16 - Prob. 1COQCh. 16 - A diploid eukaryotic cell has 10 chromosomes (5...
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- Learning Task 2: Directions: Identify if the statement is Mitosis or Meiosis. 11. 12. 13. 14. attach to the chromatids at the centromere and pull apart the chromatids. 15. is a continuous process of cell division which occurs in all types of living cells. involves four basic phases - prophase, metaphase, anaphase and telophase. in humans, this means the chromosome number is reduced from 46 to 23. In _the nuclear membrane is broken down, spindle fibers (microtubules) each nucleus is identical to the original nucleus as it was in G1.arrow_forwardExercise Observe the diagram below and answer the following questions: Image Source: Wikimedia Commons 18₂1)-(²) (Cr)-(1 1. Which process is represented in these diagrams? Mitosis or meiosis? Explain your answer. 2. How many chromosomes did the cell start with? 3. How many chromosomes are present at the end of division I? 4. How many chromosomes are present in each cell at the end of division II? Homologous Chromosomes 5. Explain how meiosis results in UNIQUE cells. 6. Is this cell division occurring in a plant cell or an animal cell? What is the main difference between the two divisions?arrow_forwardQuestion 5 Review Concept 12.2 Phases of Cell Cycle. Match the term and its description. Each term can only be used once. Chromosomes are duplicated during this phase. [ Choose ) Mitosis and cytokinesis are parts of this phase called [ Choose ) The life of a cell from formation to its own division is called [ Choose ) > >arrow_forward
- Anaphase: The kinetochore microtubules that make up the spindle begin to shorten, separating the sister chromatids from one another and drawing each to opposite poles of the cell. Polar microtubules assist in this process as they begin to lengthen and push the poles farther from each other. Why is this separation of chromatids necessary?arrow_forwardVISUALIZE Sketch a roughly cuboidal cell preparing to divide. Indicate the orientation of the preprophase band and the site where the new cell walls of the daughter cells will form.arrow_forwardDiscuss Concepts A cell has 38 chromosomes. After mitosis and cell division, one daughter cell has 39 chromosomes and the other has 37. What might have caused these abnormal chromosome numbers? What effects do you suppose this might have on cell function? Why?arrow_forward
- Question 5 Describe briefly the TWO distinct roles of the v-SNARE and t-SNARE proteins in vesicle transport. O They generate mechanical forces needed for budding the vesicles O They provide mechanical forces needed for transporting vesicles in the cytosol O They provide specificity by matching particular membrane compartments O They hydrolyze GTP to allow vesicles to pinch off a membrane compartment O They generate mechanical forces needed for fusing different membrane compartments O They enable vesicle cargo to be concentrated with its receptorarrow_forward11:51 B +$. ← MitosisAndMeiosis.docx AD B C D E F 2. In what stage were most of the onion root tip cells? Does this make sense? 4. What would happen if mitosis were uncontrolled? 3. As a cell grows, what happens to its surface area-to-volume ratio (hint: think of a balloon being blown up)? How does this ratio change with respect to cell division? 5. How accurate were your time predictions for each stage of the cell cycle? & ON 5G A A C 6. Discuss one observation you found interesting while looking at the onion root tip cells. Cell Cycle Division: Mitosis Beads Dia ר Dronhaco EXPERIMENT 2: FOLLOWING CHROMOSOMAL DNA MOVEMENT THROUGH MITOSIS PAGE 5/... OeScience Labs, 2016arrow_forwardComparing Mitosis and Meiosis: How many cells at the end? The ploidy of the end cells? The purpose of the process (when is it used)? The differences in the steps of each process (eg - how are metaphase, metaphase I, and metaphase II different)?arrow_forward
- EXERCISE 5 MITOSIS AND MEIOSIS COMPARISON Work with a group of your classmates to review the cell division processes in Exercises 3 and 4 (or the diagrams of mitosis and meiosis from Figures 2.8 and 2.9). Use the information to compare the two processes of cell division and complete the following chart and questions. For each of the descriptions on the left, place a mark in the appropriate cell division column on the right. Occurs in Gamete-Forming Cells Occurs in Somatic Cells Has One Cell Division Has Two Cell Divisions Results in Two Daughter Cells Results in Four Daughter Cells Results in Daughter Cells with Half the Original Cell's Genetic Material Results in Daughter Cells That Are Exact Copies of the Original Cell Mitosis Meiosisarrow_forwardDRAW and LABEL - Below are the four phases of Mitosis. Fill in the cellular contents that are visible in each phase. (Hint: chromosomes and attachments) May use either animal or plant for example. METAPHASE ANAPHASE TELOPHASE PROPHASEarrow_forwardMODEL 1: M-phase checkpoint G2 checkpoint 1. Consider each of the cells described below and predict at which stage of the cell cycle (G1, S, G2, M, or GO) they are currently in Mitosis A newly generated daughter cell G1 A cell that is actively using DNA polymerase A cell with fully condensed chromosomes A mature, functioning neuron (Hint: It will never divide again) G, checkpoint A cell with uncondensed, replicated chromosomes DNA Synthesisarrow_forward
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