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प्रश्न
Differentiate between Centrosome and centromere.
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उत्तर
| Centrosome | Centromere |
| It is an organelle of the animal cell. | It is a non-stainable part of the chromosome at which two chromatids join. |
| It contains two centrioles, which move towards the opposite poles and form spindle fibres during cell division | It provides attachment of spindle fibres during cell division. |
| They are responsible for the inheritance of characters from parents to off-spring. Chromosomes also help in cell division and control various metabolic activities. | It is the region of attachment of the sister chromatids and also the site of attachment to the spindle fibre. |
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संबंधित प्रश्न
Genetic recombination occurs in ______ phase of prophase of meiosis-I.
Describe anaphase in mitosis.
The fig given alongside shows a certain stage in a cell division in a cell with four chromosomes.
(i) Name the parts of the chromosome labeled A and B.
(ii) Name the structure C. what is its function?
(iii) Name the type of division . Give a reason.
(iv) Name the stage of division.
(v) Name the stages before and after the stage shown in diagram.
In which one of the following options the two stages of mitosis have been given in correct sequence?
The diagram below represents a certain stage of a cell.
(i) Is it an animal cell or a plant cell ? Give one reason in support of your answer.
(ii) Label the parts numbered 1 – 3.
(iii) Which stage (phase) of mitosis is represented in this diagram
Explain the Term Pachytene
Name the Following
Nuclear envelope and nucleoli reappear in which stage.
Complete the following sentence with appropriate word :
______means the splitting of the nucleus.
Complete the following sentence with appropriate word :
Colchicine arrests cell division at __________.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The alkaloid colchicine inhibits the formation of the mitotic spindle.
Multiple Choice Question:
Karyokinesis is the division of
Write the functional activity of the following structure:
Colchicine
Give the sequence of the events occurring during the prophase of mitosis.
The diagram given below represents a stage in mitosis.
- Identify the stage given above.
- Give one reason to support your answer in (a).
- Mention the number of chromosomes given in the diagram.
During Mitosis what is the position of chromatids in the anaphase?
What is the main function of the spindle fibres during mitosis?
