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Comment on the statement – Telophase is reverse of prophase.

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प्रश्न

Comment on the statement – Telophase is reverse of prophase.

दीर्घउत्तर
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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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पाठ 10: Cell Cycle and Cell Division - Exercises [पृष्ठ ५३]

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एनसीईआरटी एक्झांप्लर Biology Exemplar [English] Class 11
पाठ 10 Cell Cycle and Cell Division
Exercises | Q 1. | पृष्ठ ५३

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.

  1. Number of chromosomes (N) per cell
  2. Amount of DNA content (C) per cell

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?


The centriole undergoes duplication during ______


Cell division cannot be stopped in which phase of the cell cycle?


Mitosis is characterised by ______.


Between a prokaryote and a eukaryote, which cell has a shorter cell division time?


Which of the phases of cell cycle is of longest duration?


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?


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:

Pairing between homologous chromosomes takes place.


Spindle fibers attach to kinetochores of chromosomes during ______.


Following are the stages of cell division:

  1. Gap 2 phase
  2. Cytokinesis
  3. Synthesis phase
  4. Karyokinesis
  5. Gap 1 phase

Choose the correct sequence of stages from the options given below:


Match List I with List II:

List I List II
A. M Phase I. Proteins are synthesised
B. G Phase II. Inactive phase
C. Quiescent stage III. Interval between mitosis and initiation of DNA replication
D. G, Phase IV. Equational division

Choose the correct answer from the options given below:


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