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प्रश्न
What is the average cell cycle span for a mammalian cell?
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उत्तर
In a 24-hour period, it takes only one hour for cell division to be complete in human cells or mammalian cells.
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संबंधित प्रश्न
Distinguish cytokinesis from karyokinesis.
Describe the events taking place during interphase.
Why is mitosis called equational division?
Analyse the events during every stage of cell cycle and notice how the following two parameters change.
- Number of chromosomes (N) per cell
- Amount of DNA content (C) per cell
Cells in the quiescent stage (Go)
Name the stage of mitosis in which chromosomes are arranged on the equator of spindle:
Match List - I with List - II.
| List I | List II | ||
| (a) | S phase | (i) | Proteins are synthesized |
| (b) | G2 phase | (ii) | Inactive phase |
| (c) | Quiescent stage | (iii) | Interval between mitosis and initiation of DNA replication |
| (d) | G1 phase | (iv) | DNA replication |
Choose the correct answer from the options given below.
The fruit fly has 8 chromosomes (2n) in each cell. During the interphase of Mitosis if the number of chromosomes in G1 phase is 8, what would be the number of chromosomes after the S phase?
Mitosis is characterised by ______.
Which part of the human body should one use to demonstrate stages in mitosis?
It is said that the one cycle of cell division in human cells (eukaryotic cells) takes 24 hours. Which phase of the cycle, do you think occupies the maximum part of cell cycle?
While examining the mitotic stage in a tissue, one finds some cells with 16 chromosomes and some with 32 chromosomes. What possible reasons could you assign to this difference in chromosome number. Do you think cells with 16 chromosomes could have arisen from cells with 32 chromosomes or vice versa?
Mitosis results in producing two cells which are similar to each other. What would be the consequence if the following irregularities occur during mitosis?
Duplication of DNA does not occur
Two key events take place, during S phase in animal cells, DNA replication and duplication of centriole. In which parts of the cell do events occur?
Name the phase of the cell cycle at which the following event occurs:
Pairing between homologous chromosomes takes place.
Spindle fibers attach to kinetochores of chromosomes during ______.
Following are the stages of cell division:
- Gap 2 phase
- Cytokinesis
- Synthesis phase
- Karyokinesis
- Gap 1 phase
Choose the correct sequence of stages from the options given below:
