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Q. No.Identify the correct statements regarding Meiosis:
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 |
92%
From NCERT
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Match the phases of Prophase I in Column I with corresponding events in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A | Zygotene | P | Recombination |
| B | Pachytene | Q | Terminalisation of chismata |
| C | Diplotene | R | Synapsis |
| D | Diakinesis | S | Dissolution of synaptonemal complex |
| A | B | C | D | |
| 1. | R | P | S | Q |
| 2. | R | P | Q | S |
| 3. | P | R | S | Q |
| 4. | P | R | Q | S |
Subtopic: Cell Cycle: Meiosis I |
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From NCERT
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During pachytene of prophase I of meiosis I:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | the four chromatids of each bivalent chromosome become distinct and clearly appear as tetrads. |
| II: | there is the appearance of recombination nodules. |
| III: | crossing over occurs. |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Cell Cycle: Meiosis I |
81%
From NCERT
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The beginning of diplotene of prophase I of meisosis I is recognised by:
I: the dissolution of the synaptonemal complex.
II: and the tendency of the recombined homologous chromosomes of the bivalents to separate
from each other at the sites of crossovers.
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 dissolution of the synaptonemal complex.
II: and the tendency of the recombined homologous chromosomes of the bivalents to separate
from each other at the sites of crossovers.
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 I |
From NCERT
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Which stage of prophase I of meiosis I can last for months or years in oocytes of some vertebrates?
1. Zygotene
2. Pachytene
3. Diplotene
4. Diakinesis
1. Zygotene
2. Pachytene
3. Diplotene
4. Diakinesis
Subtopic: Cell Cycle: Meiosis I |
91%
From NCERT
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During Metaphase I:
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 bivalent chromosomes align on the equatorial plate. |
| II: | The microtubules from the opposite poles of the spindle attach to the kinetochore of homologous chromosomes. |
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 I |
92%
From NCERT
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The stage of meiosis I, characterised by the following events, is:
I: The nuclear membrane and nucleolus reappear.
II: Some dispersion of chromosomes.
1. Prophase I
2. Metaphase I
3. Anaphase I
4. Telophase I
I: The nuclear membrane and nucleolus reappear.
II: Some dispersion of chromosomes.
1. Prophase I
2. Metaphase I
3. Anaphase I
4. Telophase I
Subtopic: Cell Cycle: Meiosis I |
94%
From NCERT
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In contrast to meiosis I, meiosis II:
| 1. | is much lengthy in duration. |
| 2. | leads to reduction in the number of chromosomes. |
| 3. | is characterised by replication of DNA just before its beginning. |
| 4. | resembles a normal mitosis. |
Subtopic: Cell Cycle: Meiosis II |
83%
From NCERT
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In meiotic cell division, the simultaneous splitting of the centromere of each chromosome allowing sister chromatids to move toward opposite poles of the cell by shortening of microtubules attached to kinetochores, occurs during:
1. Metaphase I
2. Metaphase II
3. Anaphase I
4. Anaphase II
1. Metaphase I
2. Metaphase II
3. Anaphase I
4. Anaphase II
Subtopic: Cell Cycle: Meiosis II |
81%
From NCERT
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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
1. Metaphase I
2. Metaphase II
3. Anaphase I
4. Anaphase II
Subtopic: Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
65%
From NCERT
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