Q. No.Which of the following distinguishes the prophase I of meiosis from the prophase of mitosis?
1. homologous chromosomes pair up
2. spindle forms
3. nuclear membrane breaks down
4. chromosomes become visible
1. homologous chromosomes pair up
2. spindle forms
3. nuclear membrane breaks down
4. chromosomes become visible
With respect to meiosis, when does DNA replication occur?
| 1. | Before meiosis I only | 2. | After meiosis I only |
| 3. | Before and after meiosis I | 4. | After meiosis II |
The phase of mitosis in which the spindle fibers break apart, two new nuclear membranes begin to form, and the chromosomes disperse into chromatin is
| 1. | metaphase | 2. | telophase |
| 3. | anaphase | 4. | prophase |
The most important significance of meiosis is that:
| 1. | It increases variations in the gene pool of the species that helps in evolution of that species. |
| 2. | It causes growth in the multicellular organisms. |
| 3. | It conserves specific number of chromosomes in each species across generations. |
| 4. | It is vital for repair and regeneration functions in the living organisms. |
Consider the following statements regarding meiosis:
| I: | At metaphase I, the microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes. |
| II: | At anaphase I, the homologous chromosomes separate, while sister chromatids remain associated with each other. |
Of the two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
During meiosis, the bivalent chromosomes clearly appear as tetrads first at:
| 1. | Zygotene of Prophase I | 2. | Pachytene of Prophase I |
| 3. | Metaphase I | 4. | Anaphase I |
Consider the following key events:
| I: | Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements. |
| II: | Nucleolus, Golgi complex and ER reform. |
The stage of mitosis characterized by these key events is:
| 1. | Prophase | 2. | Metaphase |
| 3. | Anaphase | 4. | Telophase |
During diakinesis of prophase I:
I. Terminalisation of chiasmata takes place.
II. Meiotic spindle is assembled.
III. Nucleolus disappears and the nuclear membrane breaks down.
The correct statements are:
| 1. | I, II and III | 2. | I and II only |
| 3. | I and III only | 4. | II and III only |
Identify the correct statement regarding meiosis amongst the following:
| I: | Meiosis involves two sequential cycles of nuclear and cell divisions but only a single cycle of DNA replication. |
| II: | Meiosis II is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase. |
| III: | Meiosis involves pairing of bivalents and recombinations between them. |
| 1. | I only | 2. | I and II only |
| 3. | I and III only | 4. | I, II and III |
Consider the following two statements:
| I: | The growth of multi-cellular organisms is due to mitosis. |
| II: | Mitosis results in the production of diploid daughter cells with identical genetic complement usually. |
Of the two statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
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