1. What propels the centrosomes apart from one anotherduring prophase?2. How do the kinetochores of sister chromatids end upfacing in opposite directions?3. What role do the nonkinetochore microtubules playduring mitosis?4. During prometaphase, the sister chromatids jerk backand forth. What causes this back-and-forth motion?5. When in mitosis does the cell reach the M checkpoint,and what is its function?6. Imagine a cell with a genetic mutation that prevents itfrom synthesizing functional cohesins. At what stagemight the cell cycle be disrupted? Support youranswer with evidence from the text.7. Cytokinesis, the last stage of the mitotic M-phase,divides the original cell into two daughter cells. Howdo these daughter cells compare genetically? 8. How does the size of the daughter cells immediatelyafter cytokinesis compare to the size of the parent cellat the end of G,?9. Imagine that an animal cell is treated in G, with a toxinthat prevents polymerization of actin intomicrofilaments. At what subsequent stage would thecell cycle probably be disrupted? Support your answerwith evidence from the text.

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1. What propels the centrosomes apart from one another during prophase? 2. How do the kinetochores of sister chromatids end up facing in opposite directions? 3. What role do the nonkinetochore microtubules play during mitosis?

1. What propels the centrosomes apart from one another during prophase? 2. How do the kinetochores of sister chromatids end up facing in opposite directions? 3. What role do the nonkinetochore microtubules play during mitosis?

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter6: Reproduction At The Cellular Level

Section: Chapter Questions

Problem 1ACQ: Figure 6.4 Which of the following is the correct order of events in mitosis? a. Sister chromatids...

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Cell Division

Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:

Question

1. What propels the centrosomes apart from one another
during prophase?
2. How do the kinetochores of sister chromatids end up
facing in opposite directions?
3. What role do the nonkinetochore microtubules play
during mitosis?
4. During prometaphase, the sister chromatids jerk back
and forth. What causes this back-and-forth motion?
5. When in mitosis does the cell reach the M checkpoint,
and what is its function?
6. Imagine a cell with a genetic mutation that prevents it
from synthesizing functional cohesins. At what stage
might the cell cycle be disrupted? Support your
answer with evidence from the text.
7. Cytokinesis, the last stage of the mitotic M-phase,
divides the original cell into two daughter cells. How
do these daughter cells compare genetically?

8. How does the size of the daughter cells immediately
after cytokinesis compare to the size of the parent cell
at the end of G,?
9. Imagine that an animal cell is treated in G, with a toxin
that prevents polymerization of actin into
microfilaments. At what subsequent stage would the
cell cycle probably be disrupted? Support your answer
with evidence from the text.

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Figure 10.6 Which of the following is the correct order of events in mitosis? Sister chromatids line up at the metaphase plate. The kinetochore becomes attached to the mitotic spindle. The nucleus reforms and the cell divides. Cohesin proteins break down and the sister chromatids separate. The kinetochore becomes attached to the mitotic spindle. Cohesin proteins break down and the sister chromatids separate. Sister chromatids line up at the metaphase plate. The nucleus reforms and the cell divides. The kinetochore becomes attached to the cohesin proteins. Sister chromatids line up at the metaphase plate. The kinetochore breaks down and the sister chromatids separate. The nucleus reforms and the cell divides. The kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the metaphase plate. Cohesin proteins break down and the sister chromatids separate. The nucleus reforms and the cell divides.
The mitotic spindles arise from which cell structure? centromere centroscme kinetochore cleavage furrow
The cell above is a lung cell of a salamander. In which stage of mitosis is it? What are the structures visible in green and blue fluorescence?
Figure 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 initotic 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.
The chromosomes become visible under a light microscope during which stage of mitosis? prophase prometaphase metaphase anaphase
Metaphase in mitosis is similar to what stage in meiosis? a. prophase I b. prophase II c. metaphase I d. metaphase II e. crossing-over
11. What moves the chromatids during mitosis? 12. What anchors the spindle? 13. What are the four phases of mitosis? 14. How many daughter cells are created from mitosis and cytokinesis? 15. During what phase does cytokinesis begin? 16. If a human cell has 46 chromosomes, how many chromosomes will be in ea daughter cell?
1.What phase of mitosis is this? 2.What is the indicated structure 1? chromosome chromosome with two sister chromatids centrioles/centrosome spindle fibres metaphase plate 3.If the diploid (2n) number of this cell is 8 how many chromosomes are present Answer. 4.If the diploid (2n) number of this cell is 8 how many sister chromatids are present Answer. 5.If the diploid (2n) number of this cell is 8 how many homologous pairs are present Answer.
3. Identify the phase of mitosis that is being described by each statement. Some phases will be described by multiple statements. (P) Prophase _(PR) Prometaphase (M) Metaphase (A) Anaphase (T) Telophase Sister chromatids are pulled apart Chromosomes begin to disappear Nuclear envelope reforms Chromatids align in the center of the cell Chromatids attach to spindles Nuclear envelop breaks down Chromosomes condense and become visible Cell begins to split into daughter cells
1.) Some of the events that occur during mitosis are as follows: 1. separation of sister chromatids to opposite poles 2. condensation of chromatin into compact chromosomes 3. alignment of chromosomes along the cell equator 4. reappearance of nuclear membrane Using the numbers above, match the above-mentioned events occurring during mitosis with the stages in which they occur. Prophase _____ Metaphase _____ Anaphase _____ Telophase 2.) Four different phases that occur during the mitotic phase of cell cycle are as follows: 1. prophase 2. telophase 3. anaphase 4. metaphase The correct order in which phases of the mitotic division occur after G2 phase is __________, _____________, ___________ and ___________.
Prophase Metaphase Anaphase Telophase
8) What is produced after mitosis? 4 identical somatic cells 2 different (non-identical) somatic cells 2 identical somatic cells 4 different (non-identical) gametes