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प्रश्न
Comment on the statement – Telophase is reverse of prophase.
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उत्तर
Prophase is marked by the initiation of condensation of chromosomal material. The chromosomal material becomes untangled during the process of chromatin condensation. At the beginning of the final stage of mitosis, i.e. telophase, the chromosomes that have reached their respective poles decondense and lose their individuality.
Cells at the end of prophase, when viewed under the microscope, do not show golgi complexes, endoplasmic reticulum, nucleolus and the nuclear envelope. In the telophase stage nuclear envelope assembles around the chromosome clusters. Nucleolus, golgi complex and ER reform.
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संबंधित प्रश्न
What is the average cell cycle span for a mammalian cell?
What is G0 (quiescent phase) of cell cycle?
Why is mitosis called equational division?
Cells in the quiescent stage (Go)
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 centriole undergoes duplication during ______
Cell division cannot be stopped in which phase of the cell cycle?
Cells which are not dividing are likely to be at ______.
Between a prokaryote and a eukaryote, which cell has a shorter cell division time?
Which tissue of animals and plants exhibits meiosis?
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?
Label the diagram and also determine the stage at which this structure is visible.
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
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.
