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Q. No.During prophase I of meiosis I, recombination between homologous chromosomes is completed:
1. in the Zygotene
2. in the beginning of the Pachytene
3. by the end of Pachytene
4. in the beginning of the Diplotene
Subtopic: Cell Cycle: Meiosis I |
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Identify the incorrect statement regarding diakinesis of prophase I of meiosis I:
| 1. | It is the final stage of meiotic prophase I. |
| 2. | It is marked by terminalisation of chiasmata. |
| 3. | During this phase, the meiotic spindle is assembled to prepare the homologous chromosomes for separation. |
| 4. | By the end of diakinesis, the nucleolus reappears and the nuclear envelope also reappears. |
Subtopic: Cell Cycle: Meiosis I |
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Regarding anaphase I:
| Statement I: | The homologous chromosomes separate, while sister chromatids remain associated at their centromeres. |
| Statement II: | It is the basis of segregation. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is incorrect. |
| 3. | Statement I is correct and Statement II is correct. |
| 4. | Statement I is incorrect and Statement II is correct. |
Subtopic: Cell Cycle: Meiosis I |
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In telophase I:
| Statement I: | The nuclear membrane and nucleolus reappear. |
| Statement II: | The chromosomes reach the extremely extended state of the interphase nucleus. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is incorrect. |
| 3. | Statement I is correct and Statement II is correct. |
| 4. | Statement I is incorrect and Statement II is correct. |
Subtopic: Cell Cycle: Meiosis I |
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Consider the given two statements:
| Statement I: | At Metaphase I the chromosomes align at the equator and the microtubules from opposite poles of the spindle get attached to the kinetochores of sister chromatids. |
| Statement II: | At metaphase II the bivalent chromosomes align on the equatorial plate and microtubules from the opposite poles of the spindle attach to the kinetochore of homologous chromosomes. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is incorrect. |
| 3. | Statement I is correct and Statement II is correct. |
| 4. | Statement I is incorrect and Statement II is correct. |
Subtopic: Cell Cycle: Meiosis I |
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In meiosis, the splitting of the centromere of each chromosome takes place during:
| 1. | Metaphase I | 2. | Metaphase II |
| 3. | Anaphase I | 4. | Anaphase II |
Subtopic: Cell Cycle: Meiosis II |
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Subtopic: Intro to Cell Cycle & Interphase | Cell Division: Mitosis (Karyokinesis) | Cell Division: Mitosis (Cytokinesis) |
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During which stage of prophase I of meiosis I, the four chromatids of each of the bivalent chromosomes
become distinct and clearly appear as tetrads?
become distinct and clearly appear as tetrads?
| 1. | Leptotene | 2. | Zygotene |
| 3. | Pachytene | 4. | Diplotene |
Subtopic: Cell Cycle: Meiosis I |
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What is incorrect regarding the second stage of prophase I?
| 1. | It is called Zygotene. |
| 2. | Chromosomes start pairing together and this process of association is called synapsis. |
| 3. | Such paired chromosomes are called heterologous chromosomes. |
| 4. | Chromosome synapsis is accompanied by the formation of complex structure called synaptonemal complex. |
Subtopic: Cell Cycle: Meiosis I |
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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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