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प्रश्न
Describe the events taking place during interphase.
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उत्तर
Even though it is referred to be the resting phase, the interphase is highly metabolically active. It is the period of time when the cell gets ready to divide by going through a systematic process of both cell growth and DNA replication.
G1 (Gap 1) phase
S (Synthesis) phase
G2 (Gap 2) phase
The G1 phase refers to the period between the mitosis of the preceding cell cycle and the commencement of DNA replication. In the G1 phase, the cell is metabolically active and undergoes continuous growth without DNA replication. The synthesis phase, or S phase, denotes the time frame in which DNA replication or synthesis occurs. DNA doubles in each cell throughout this period. In animal cells, centrioles duplicate in the cytoplasm while DNA replication takes place in the nucleus during the S phase. DNA synthesis ceases during the G2 phase, but protein and RNA synthesis continues as the cell grows in preparation for mitosis.
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संबंधित प्रश्न
What is the average cell cycle span for a mammalian cell?
Distinguish cytokinesis from karyokinesis.
What is G0 (quiescent phase) of cell cycle?
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
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.
Mitosis is characterised by ______.
Between a prokaryote and a eukaryote, which cell has a shorter cell division time?
Which tissue of animals and plants exhibits meiosis?
Label the diagram and also determine the stage at which this structure is visible.
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
Comment on the statement – Telophase is reverse of prophase.
Name the phase of the cell cycle at which the following event occurs:
Chromosomes are moved to spindle equator.
Name the phase of the cell cycle at which the following event occurs:
Centromere splits and chromatids separate.
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 ______.
