Q. No.Telophase of mitosis is characterised by all the following events, except:
| 1. | Chromosomes cluster at opposite spindle poles, and their identity is lost as discrete elements. |
| 2. | Nuclear envelope develops around the chromosome clusters at each pole, forming two daughter nuclei. |
| 3. | Nucleolus, Golgi complex and ER reform. |
| 4. | Pairing of homologous chromosomes. |
Subtopic: Cell Division: Mitosis (Karyokinesis) | Cell Cycle: Meiosis I |
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The cell shown in the given diagram is in:
 |
|
Subtopic: Cell Cycle: Meiosis I |
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The cell shown in the given figure is most likely at:
| 1. | Metaphase I | 2. | Metaphase II |
| 3. | Anaphase I | 4. | Anaphase II |
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
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In meiosis:
| 1. | A single round of DNA replication is followed by two sequential divisions with chromosome number and DNA content getting reduced twice |
| 2. | A single round of DNA replication is followed by two sequential divisions with chromosome number getting reduced twice and DNA content getting reduced once |
| 3. | A single round of DNA replication is followed by two sequential divisions with chromosome number getting reduced once and DNA content getting reduced twice |
| 4. | A single round of DNA replication is followed by two sequential divisions with chromosome number and DNA content getting reduced once |
Subtopic: Cell Cycle: Meiosis I |
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Meiosis results in the formation of:
| 1. | Two genetically identical diploid cells |
| 2. | Two genetically non identical diploid cells |
| 3. | Four genetically identical haploid cells |
| 4. | Four genetically non identical haploid cells |
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
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Consider the two statements:
| Assertion (A): | Meiosis ensures the production of haploid phase in the life cycle of sexually reproducing organisms. |
| Reason (R): | Syngamy restores the diploid condition in sexually reproducing organisms. |
| 1. | (A) is True; (R) is False |
| 2. | Both (A) and (R) are True and (R) correctly explains (A) |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 4. | (A) is False; (R) is True |
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
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All the following are key features of meiosis except:
| 1. | Meiosis involves two sequential cycles of nuclear and cell division called meiosis I and meiosis II but only a single cycle of DNA replication. |
| 2. | Meiosis I is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase. |
| 3. | Meiosis involves pairing of homologous chromosomes and recombination between non-sister chromatids of homologous chromosomes. |
| 4. | Four haploid cells are formed at the end of meiosis I. |
Subtopic: Cell Cycle: Meiosis I |
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Identify the correct statements regarding Meiosis:
1. I and II only
2. III and IV only
3. I and IV only
4. II and III only
| I: | Meiosis involves two sequential cycles of nuclear and cell division called meiosis I and meiosis II but only a single cycle of DNA replication. |
| II: | Meiosis I is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase and the daughter cells of meiosis I replicate DNA during interkinesis. |
| III: | Meiosis involves pairing of heterologous chromosomes and recombination between sister chromatids of homologous chromosomes. |
| IV: | Four haploid cells are formed at the end of meiosis II. |
1. I and II only
2. III and IV only
3. I and IV only
4. II and III only
Subtopic: Cell Cycle: Meiosis I |
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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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Synapsis occurs between
1. mRNA and ribosomes
2. Spindle fibers and centromere
3. Two homologous chromosomes
4. A male and a female gamete
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
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