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Q. No.The events of a cell cycle:
I:
are themselves under genetic control
II:
have to take place in a coordinated way
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Intro to Cell Cycle & Interphase |
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The completion of prophase of mitosis is marked by the following characteristic events except:
| 1. | Chromosomal material condenses to form compact mitotic chromosomes. |
| 2. | Chromosomes are seen to be composed of two chromatids attached together at the centromere. |
| 3. | Centrosome undergoes duplication during prophase. |
| 4. | Each centrosome radiates out microtubules called asters. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
72%
From NCERT
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Identify the incorrectly matched pair:
| 1. |  |
Early Prophase |
| 2. |  |
Late Prophase |
| 3. |  |
Transition to Metaphase |
| 4. |  |
Anaphase |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
96%
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The given figure shows a cell at various stages of mitosis. What will be the number of chromosomes and content of DNA in the cells shown if the number of chromosomes and the content of DNA was 2N and 2C respectively at G1 phase?
1. 2N and 2C
2. 2N and 4C
3. 4N and 2C
4. 4N and 4C
1. 2N and 2C
2. 2N and 4C
3. 4N and 2C
4. 4N and 4C
Subtopic: Intro to Cell Cycle & Interphase | Cell Cycle: Meiosis II |
From NCERT
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Prophase I has been subdivided into the five phases based on chromosomal behaviour and the correct chronology of these phases [beginning from the earliest] will be:
| 1. | Leptotene, Zygotene, Pachytene, Diakinesis and Diplotene. |
| 2. | Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis. |
| 3. | Leptotene, Pachytene, Zygotene, Diakinesis and Diplotene. |
| 4. | Diplotene, Zygotene, Pachytene, Diakinesis and Leptotene. |
Subtopic: Cell Cycle: Meiosis I |
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In meiosis:
1. Only I, II and III are correct
2. Only I, III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
| I: | paired chromosomes are called homologous chromosomes. |
| II: | Chromosome synapsis is accompanied by the formation of complex structure called synaptonemal complex. |
| III: | The complex formed by a pair of synapsed homologous chromosomes is called a bivalent or a tetrad. |
| IV: | Tetrads are most clearly visible during zygotene. |
1. Only I, II and III are correct
2. Only I, III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
Subtopic: Cell Cycle: Meiosis I |
82%
From NCERT
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Crossing over:
1. Only I, II and III are correct
2. Only I, III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
| I: | is the exchange of genetic material between two sister chromatids of heterologous chromosomes. |
| II: | is an enzyme-mediated process and the enzyme involved is called recombinase. |
| III: | leads to recombination of genetic material on the two chromosomes. |
| IV: | is completed by the end of pachytene, leaving the chromosomes linked at the sites of crossing over. |
1. Only I, II and III are correct
2. Only I, III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
Subtopic: Cell Cycle: Meiosis I |
90%
From NCERT
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X-shaped structures, called chiasmata, are visible during:
1. Zygotene of prophase I
2. Pachytene of prophase I
3. Diplotene of prophase I
4. Diakinesis of prophase I
1. Zygotene of prophase I
2. Pachytene of prophase I
3. Diplotene of prophase I
4. Diakinesis of prophase I
Subtopic: Cell Cycle: Meiosis I |
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During anaphase I of meiosis I:
| 1. | The homologous chromosomes separate, while sister chromatids remain associated at their centromeres. |
| 2. | Simultaneous splitting of the centromere of each chromosome allows the sister chromatids to move towards opposite poles of the cell. |
| 3. | The nucleolus disappears and the nuclear envelope also breaks down. |
| 4. | the centrosome in animal cells undergoes replication. |
Subtopic: Cell Cycle: Meiosis I |
91%
From NCERT
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At metaphase II:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | the chromosomes align at the equator. |
| II: | the microtubules from opposite poles of the spindle get attached to the kinetochores of sister chromatids. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Cell Cycle: Meiosis II |
91%
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