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Initiation and complete condensation of chromosome occur respectively in

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Important Questions on Cell Cycle and Cell Division

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Nuclear membrane and nucleolus which disappear at prophase, reappear back during which phase?
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The chromosomes cluster at opposite poles and their identity is lost as discrete elements during
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Following events represent which stage of mitosis?
(i) Spindle fibres attach to kinetochores of chromosomes.
(ii) All the chromosomes coming to lie at the equator.
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The events shown below occur during different phases
A. Chromosome identify is lost as discrete elements.
B. Condensation of the chromosome is completed, and they can be observed clearly under the microscope.
C. Chromosomal material becomes untangled.
D. Centromere split and chromatids separate.

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A stage of cell division is depicted in the given figure. Select the most appropriate option as an answer which gives the correct identification of the stage.
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Read the following statements and identify which ones are true (T) and which ones are false (F).
A. The equational division is usually restricted to the diploid cells only.
B. In some lower plants and some social insects, haploid cells divide by mitosis.
C. The cell divides to restore nucleus cytoplasmic ratio
D. The cells of the upper layer of the epidermis cells of the lining of the gut and blood cells are replaced continuously by mitotic divisions.