EBK CAMPBELL BIOLOGY IN FOCUS
2nd Edition
ISBN: 8220101459299
Author: Reece
Publisher: PEARSON
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Chapter 9, Problem 9TYU
FOCUS ON EVOLUTION
The result of mitosis is that the daughter cells end up with the same number of chromosomes that the parent cell had. Another way to maintain the number of chromosomes would be to carry out cell division first and then duplicate the chromosomes in each daughter cell. Assess whether this would be an equally good way of organizing the cell cycle. Explain why evolution has not led to this alternative.
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EVOLUTION CONNECTION The result of mitosis is that thedaughter cells end up with the same number of chromosomesthat the parent cell had. Another potential way to maintain thenumber of chromosomes would be to carry out cell divisionfirst and then duplicate the chromosomes in each daughtercell. Assess whether this would be an equally good way oforganizing the cell cycle. Explain why evolution has not ledto this alternative.
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Mitosis Worksheet
The diagram below shows six cells in various phases of the cell cycle. Note the cells are not arranged in the
order in which mitosis occurs and one of the phases of mitosis occurs twice. Use the diagram to answer
questions 1-7.
Phases of the Cell Cycle
1)
Cells A and F show an early and a late stage of the same phase of mitosis. What phase is it?
2)
Which cell is in metaphase?
3)
Which cell is in the first phase of mitosis?
4)
In cell A, what structure is labeled X?
5)
Which cell is in the "in between" phase of mitosis?
6)
Place the diagrams in order from first to last.
7)
Are the cells depicted plant or animal cells? Explain your answer.
8)
What is the longest phase of the cell cycle?
9)
Why is mitosis important?
Review the stages of the eukaryotic cell cycle. Suppose a 2N= 4 cell goes
through interphase. What are the number and structure of the chromosomes
during:
G1 phase?
S phase?
G2 phase?
If an N= 3 cell undergoes mitosis, what will be the number and structure of the
chromosomes the start of mitosis? What will the number and structure of the
chromosomes be at the end of mitosis and cytokinesis?
Chapter 9 Solutions
EBK CAMPBELL BIOLOGY IN FOCUS
Ch. 9.1 - WHAT IF? A chicken has 78 chromosomes in its...Ch. 9.2 - Compare cytokinesis in animal cells and plant...Ch. 9.2 - Prob. 3CCCh. 9.2 - Compare the roles of tubulin and actin during...Ch. 9.3 - Prob. 1CCCh. 9.3 - Prob. 2CCCh. 9.3 - Compare and contrast a benign tumor and a...Ch. 9.3 - Prob. 4CCCh. 9 - Through a microscope, you can see a cell plate...Ch. 9 - In the cells of some organisms, mitosis occurs...
Ch. 9 - Which of the following does not occur during...Ch. 9 - Prob. 4TYUCh. 9 - The drug cytochalasin B blocks the function of...Ch. 9 - DRAW IT Draw one eukaryotic chromosome as it would...Ch. 9 - The light micrograph shows dividing cells near the...Ch. 9 - SCIENTIFIC INQUIRY Although both ends of a...Ch. 9 - FOCUS ON EVOLUTION The result of mitosis is that...Ch. 9 - SYNTHESIZE YOUR KNOWLEDGE Shown here are two He La...Ch. 9 - FOCUS ON INFORMATION The continuity of life is...
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- In the cell cycle, at which stages do two chromatids make up one chromosome? a. beginning of mitosis b. end of G1 c. beginning of S d. end of mitosis e. beginning of G2arrow_forwardThe individual chromosomes become visible with a light microscope during which stage of mitosis? a. prophase b. prometaphase c. metaphase d. anaphasearrow_forwardAfter mitosis, each daughter cell contains genetic instructions that are ______ and _____ chromosome number of the parent cell. a. identical to the parent cells; the same b. identical to the parent cells; one-half the c. rearranged; the same d. rearranged; one-half thearrow_forward
- Chromosomes are duplicated during what portion of the cell cycle? a. G 1 phase b. S phase c. prophase d. prometaphasearrow_forwardDNA molecules are repeated during which step of the cell cycle? Explain how chromosomes' kinetochores function. The California two-spot octopus (Octopus bimaculoides) has 28 chromosomes in a diploid cell. Mitosis occurs in the cell. In each daughter cell, how many chromosomes do you have?arrow_forwardWhat is true of mitosis?1. A cell undergoes two cell divisions.2 .The daughter cells produced are gametes.3.Hofblogous chromosomes are separated to produce four haploid daughter cells.4. Sister chromatids separate to produce two diploid daughter dells.arrow_forward
- The diagram shows a cell that has completed mitosis and cytokinesis. Which stage of the cell cycle will both daughter cells now enter? O Meiosis Interphase O Cytokinesis The cell does not enter into a new cell cyclearrow_forwardWhich statement is true regarding mitosis?1.During prophase, the chromosomes become uncondensed and two new nuclei are formed.2.During telophase, the chromosomes align in the center of the cell.3.During metaphase, the chromosomes condense4.During anaphase, the chromatids separate and move to opposite poles.arrow_forwardFigure 6.4 Which of the following is the correct order of events in mitosis?a. Sister chromatids line up at the metaphase plate. The kinetochore becomes attached to the mitotic spindle. The nucleus re-forms and the cell divides. The sister chromatids separate.b. The kinetochore becomes attached to the mitotic spindle. The sister chromatids separate. Sister chromatids line up at the metaphase plate. The nucleus re-forms and the cell divides.c. The kinetochore becomes attached to metaphase plate. Sister chromatids line up at the metaphase plate. The kinetochore breaks down and the sister chromatids separate. The nucleus re-forms and the cell divides.d. The kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the metaphase plate. The kinetochore breaks apart and the sister chromatids separate. The nucleus re-forms and the cell divides.arrow_forward
- Match each image in the diagram to the phase of mitosis it represents Prophase Metaphase Anaphase Telophasearrow_forwardYou are watching mitosis occur in cheek epithelial cells. Which of the following would you see occurring? Select all that apply. An indentation of the cell membrane that eventualy pinches the cells into two daughter cells Formation of a cell plate Homologous chromosomes pairing together Centrioles creating the mitotic spindie Separation of sister chromatidsarrow_forwardIn your own words, briefly explain the different phases of the cell cycle. Explain what events take place at each phasearrow_forward
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