Q. No.Consider the following statements regarding meiosis:
I:
At metaphase I, the microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes.
II:
At anaphase I, the homologous chromosomes separate, while sister chromatids remain associated with each other.
Of the two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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During meiosis, the bivalent chromosomes clearly appear as tetrads first at:
| 1. | Zygotene of Prophase I | 2. | Pachytene of Prophase I |
| 3. | Metaphase I | 4. | Anaphase I |
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Consider the following key events:
| I: | Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements. |
| II: | Nucleolus, Golgi complex and ER reform. |
The stage of mitosis characterized by these key events is:
| 1. | Prophase | 2. | Metaphase |
| 3. | Anaphase | 4. | Telophase |
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During diakinesis of prophase I:
I. Terminalisation of chiasmata takes place.
II. Meiotic spindle is assembled.
III. Nucleolus disappears and the nuclear membrane breaks down.
The correct statements are:
| 1. | I, II and III | 2. | I and II only |
| 3. | I and III only | 4. | II and III only |
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Identify the correct statement regarding meiosis amongst the following:
| I: | Meiosis involves two sequential cycles of nuclear and cell divisions but only a single cycle of DNA replication. |
| II: | Meiosis II is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase. |
| III: | Meiosis involves pairing of bivalents and recombinations between them. |
| 1. | I only | 2. | I and II only |
| 3. | I and III only | 4. | I, II and III |
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Consider the following two statements:
| I: | The growth of multi-cellular organisms is due to mitosis. |
| II: | Mitosis results in the production of diploid daughter cells with identical genetic complement usually. |
Of the two statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
Consider the following two statements:
| I: | Plant cells undergo cytokinesis in a different manner than the animal cells. |
| II: | Plant cells are enclosed by a relatively inextensible cell wall. |
Of the two statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
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Cells at the end of prophase of mitosis, when viewed under the microscope, do not show:
| I: | Golgi complexes |
| II: | Endoplasmic reticulum |
| III: | Nucleolus |
| IV: | Nuclear envelope |
1. Only I and II are correct
2. Only III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
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The stage of mitosis at which morphology of chromosomes is most easily studied is the:
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
Consider the following events:
I. Centromere split and chromatids separate
II. Chromatids move to opposite poles
The stage of mitosis characterized by these two events is:
| 1. | Prophase | 2. | Metaphase |
| 3. | Anaphase | 4. | Telophase |
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