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 |
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 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 |
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.
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) |
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) |
When a cell is preparing for mitosis, it is said to be in which phase of the cell cycle?
1. | G1 | 2. | G0 |
3. | S | 4. | G2 |
In meiosis, DNA replication occurs:
1. Only once before Meiosis I
2. Only once before Meiosis II
3. Twice, once before meiosis I and once during interkinesis
4. Twice, once before meiosis I and once during anaphase I of meiosis I