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Q. No.Identify the incorrect statement regarding prophase stage of mitosis:
1.
It follows the G2 phases of interphase.
2.
It is marked by the initiation of condensation of chromosomal material.
3.
The centrosome undergoes duplication during this phase in animal cells.
4.
By the end of this phase, chromosomes are seen to be composed of two chromatids attached
together at the centromere.
together at the centromere.
Subtopic: Cell Division: Mitosis (Karyokinesis) |
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All the following events take place during the telophase stage of mitosis 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 re-form. |
| 4. | Microtubules get organised into spindle fibres. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
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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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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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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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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
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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