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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. |
संबंधित प्रश्न
Given below is a diagram representing a stage during mitotic cell division in an animal cell Examine it carefully and answer the questions which follow.
- Identify the stage. Give one reason in support of your answer.
- Name the cell organelle that forms the ‘aster’.
- Name the parts labelled 1, 2 and 3.
- Name the stage that follows the one shown above; how is that stage identified?
- Mention two differences between mitosis and meiosis with regards to:
- The number of daughter cells produced.
- The chromosome number in the daughter cells.
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.
Choose the correct answer:
Which division takes most time?
In which one of the following options the two stages of mitosis have been given in correct sequence?
Draw a labeled schematic representation of mitosis cell division.
Explain the Term Pachytene
Explain the Term Cell Diakinesis
Name the following:
Mitosis takes place in which cells.
Name the following:
The kind of division normally seen at the tip of the root and shoot system.
Name the Following
Nuclear envelope and nucleoli reappear in which stage.
Give Technical Terms
The stage in mitosis when the nucleolus starts disappearing.
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
Multiple Choice Question:
The nuclear membrane disappears in
Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the terms in Column ‘II’ with a suitable idea given in Column ‘I’.
| Column I | Column II |
| (i) Anaphase | (a) Chromosomes become arranged in a horizontal plane at the equator. |
| (ii) Prophase | (b) Daughter chromosomes move to opposite poles of the spindle. |
| (iii) Telophase | (c) Chromosomes become visible as fine, long threads. |
| (iv) Metaphase | (d) Chromosomes lose their distinctiveness and gradually become transformed into chromatin network. |
The karyotype (set of chromosomes) shown below is taken from a dividing cell in a certain individual.
(i) Is the individual male or female? Explain your answer.
(ii) How would you expect
(a) a female cell and
(b) sperm cell to differ in chromosome composition?
