Q. No.Some dividing cells exit the cell cycle and enter the vegetative inactive stage. This is called the quiescent stage G0. This process occurs at the end of:
1.
G1 phase
2.
S phase
3.
G2 phase
4.
M phase
Attachment of spindle fibers to kinetochores of chromosomes becomes evident in:
| 1. | Anaphase | 2. | Telophase |
| 3. | Prophase | 4. | Metaphase |
Match the following events that occur in their respective phases of cell cycle and select the correct option
| (a) | G1 phase | (i) | Cell grows and organelle duplication |
| (b) | S phase | (ii) | DNA replication and chromosome duplication |
| (c) | G2 phase | (iii) | Cytoplasmic growth |
| (d) | Metaphase in M-phase | (iv) | Alignment of chromosomes |
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (iii) | (iv) | (i) | (ii) |
| 3. | (iv) | (i) | (ii) | (iii) |
| 4. | (i) | (ii) | (iii) | (iv) |
Match the following with respect to meiosis:
| (a) | Zygotene | (i) | Terminalization |
| (b) | Pachytene | (ii) | Chiasmata |
| (c) | Diplotene | (iii) | Crossing over |
| (d) | Diakinesis | (iv) | Synapsis |
Select the correct option from the following:
| (a) | (b) | (c) | (d) | |
| 1. | (iv) | (iii) | (ii) | (i) |
| 2. | (i) | (ii) | (iv) | (iii) |
| 3. | (ii) | (iv) | (iii) | (i) |
| 4. | (iii) | (iv) | (i) | (ii) |
Identify the correct statement with regard to phase (Gap 1) of interphase.
| 1. | The reorganisation of all cell components takes place. |
| 2. | The cell is metabolically active, grows but does not replicate its DNA |
| 3. | Nuclear division takes place |
| 4. | DNA synthesis or replication takes place. |
Consider the given two statements:
| I: | The kinetochore is essential for the chromosome segregation that is classically associated with mitosis and meiosis. |
| II: | The kinetochore assembles on the centromere and links the chromosome to microtubule polymers from the mitotic spindle during mitosis and meiosis. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and are correct but II does not explain I |
| 3. | I is correct and II is incorrect |
| 4. | Both I and II are incorrect |
In G1 phase, a meiocyte has 2N chromosome content and 2C DNA content. The chromosome and DNA content in each cell at the end of first meiotic division would be:
| 1. | 1N; 1C | 2. | 1N; 2C |
| 3. | 2N; 4C | 4. | 2N; 2C |
In fruit flies, which have 4 chromosome pairs, the number of possible arrangements of chromosomes in resultant haploid cells at the end of meiosis II is:
| 1. | 2 | 2. | 8 |
| 3. | 16 | 4. | 64 |
Microtubules from opposite poles of the spindle get attached to the kinetochores of sister chromatids in:
| 1. | Metaphase I | 2. | Anaphase I |
| 3. | Metaphase II | 4. | Anaphase II |
Recombination between homologous chromosomes is completed by the end of:
| 1. | Zygotene | 2. | Diplotene |
| 3. | Pachytene | 4. | Diakinesis |
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