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In a eukaryote, the cell cycle typically is divided into:
1.
Two phases
2.
Three phases
3.
Four phases
4.
Five phases
Subtopic: Intro to Cell Cycle & Interphase | Cell Division: Mitosis (Karyokinesis) | Cell Division: Mitosis (Cytokinesis) |
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In a somatic eukaryotic cell undergoing mitosis, when do expect to find most number of chromosomes in the cell?
| 1. | At the end of the G1 phase |
| 2. | At the end of the S phase |
| 3. | At the end of Anaphase |
| 4. | In the resultant daughter cells |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
61%
Level 2: 60%+
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Study the given two statements – an Assertion and Reason, and select the correct answer from the options given:
| Assertion(A): | Meiosis is the mechanism by which conservation of specific chromosome number of each species is achieved across generations in sexually reproducing organisms. |
| Reason(R): | Meiosis increases the genetic variability in the populations of organisms from one generation to the next. |
| 1. | Both (A) and (R) are true and (R) correctly explains (A) |
| 2. | (A) is true but (R) is false |
| 3. | (A) is false but (R) is true. |
| 4. | Both (A) and (R) are true but (R) does not correctly explain (A). |
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
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In Prophase I of Meiosis I, recombination between homologous chromosomes is completed:
| 1. | by the end of zygotene |
| 2. | by the end of pachytene |
| 3. | at the beginning of diplotene |
| 4. | when terminalisation of chiasmata occurs at diakinesis |
Subtopic: Cell Cycle: Meiosis I |
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During meiosis I, the chromosomes start pairing at:
| 1. | Zygotene | 2. | Pachytene |
| 3. | Diplotene | 4. | Leptotene |
Subtopic: Cell Cycle: Meiosis I |
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During the metaphase stage of mitosis spindle fibres attach to chromosomes at:
| 1. | kinetochore |
| 2. | both centromere and kinetochore |
| 3. | centromere, kinetochore and areas adjoining centromere |
| 4. | centromere |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
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A stage of mitosis is shown in the diagram. Which stage is it and what are its characteristics?
| 1. | Metaphase-spindle fibers attached to kinetochores, centromeres split and chromatids separate |
| 2. | Metaphase- chromosomes moved to spindle equator, chromosomes made up of two sister chromatids |
| 3. | Anaphase - centromeres split and chromatids separate and start moving away |
| 4. | Late prophase - chromosomes move to spindle equator |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
78%
Level 2: 60%+
NEET - 2013
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Identify the incorrectly matched pair:
| 1. | Prophase II: | The nuclear membrane disappears by the end of this stage and the chromosomes again become compact. |
| 2. | Metaphase II: | The chromosomes align at the equator and the microtubules from opposite poles of the spindle get attached to the kinetochores of sister chromatids. |
| 3. | Anaphase II: | The homologous chromosomes separate, while sister chromatids remain associated at their centromeres. |
| 4. | Telophase II: | The two groups of chromosomes once again get enclosed by a nuclear envelope |
Subtopic: Cell Cycle: Meiosis II |
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| Assertion(A): | Mitosis is called equational division. |
| Reason(R): | The amount of DNA is the same in parent and progeny cells if it is mitosis. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
| 3. | (A) is true, but (R) is false. |
| 4. | (A) is false, but (R) is true. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
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| Assertion(A): | Meiosis reduces the chromosome number by half in gametes. |
| Reason(R): | Meiosis is called the reductional division. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
| 3. | (A) is true, but (R) is false. |
| 4. | (A) is false, but (R) is true. |
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
Level 3: 35%-60%
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