The diagram below shows six cells in various phases of the cell cycle. Note the
ID: 72011 • Letter: T
Question
The diagram below shows six cells in various phases of the cell cycle. Note the cells are not arranged in the order in which the cell cycle occurs. Use the diagram to answer questions 1-7. Cells A & F show an early and a late stage of the same phase of the cell cycle. What phase is it Which cell is in metaphase Which cell is in the first phase of M phase (mitosis) In cell A, what structure is labeled X List the diagrams in order from first to last to occur in the cell cycle. Are the cells depicted plant or animal cells How do you know What is the longest phase of the cell cycle Why is mitosis important Predict what would happen if an individual had faulty spindle fibers.Explanation / Answer
1.
(a) prophase
(b) anaphase
2.
(c)
3.
(a) prophase
4.
centriole
5.
D----A----C----F----E----B
6.
The cells depicted are animal cells. The reasons are:
centrioles are involved which is absent in plant cells
aster rays are formed which are absent in plant cells
cytokinesis due to furrowing of cytoplasm which is absent in plants (cytokinesis occurs by cell plate formation)
7.
Interphase is typically the longest phase of the cell cycle. This can be explained by the fact that G1 of interphase follows cell division in mitosis. Cells usually remain in G1 for about 10 hours of the 24 total hours of the cell cycle.
8.
Mitosis is important for the maintenance of the chromosomal set; each cell formed receives chromosomes that are alike in composition and equal in number to the chromosomes of the parent cell.
9.
If the spindle fibers are not properly formed, chromosomes and centrosomes during mitosis will not be properly separated which may delay mitosis or mitosis would not occur at all.