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Comment on the statement – Telophase is reverse of prophase. - Biology

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

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

संबंधित प्रश्‍न

Distinguish cytokinesis from karyokinesis.


What is G0 (quiescent phase) of cell cycle?


Name the phase of the cell cycle at which the following event occurs:

Crossing over between homologous chromosomes takes place.


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

Most cytogenic activities occur during


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 ______.


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


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


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:

Centromere splits and chromatids separate.


Name the phase of the cell cycle at which the following event occurs:

Pairing between homologous chromosomes takes place.


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