Q. No.Arrange the following events of meiosis in a correct sequence:
I. Crossing over
II. Synapsis
III. Terminalisation of chiasmata
IV. Disappearance of nucleolus
| 1. | II, I, IV, III | 2. | II, I, III, IV |
| 3. | I, II, III, IV | 4. | II, III, IV, I |
Match the following column I with column II.
| Column I | Column II |
| A. Synapsis aligns homologous chromosomes | (i) Anaphase II |
| B. Synthesis of RNA and protein | (ii) Zygotene |
| C. Action of enzyme recombinase | (iii) G2 - phase |
| D. Centromeres do not separate, but chromatids move towards opposite poles | (iv) Anaphase I |
| (v) Pachytene |
1. A-(ii) B-(i) C-(iii) D-(iv)
2. A-(ii) B-(iii) C-(v) D-(iv)
3. A-(i) B-(ii) C-(v) D-(iv)
4. A-(ii) B-(iii) C-(iv) D-(v)
A somatic cell that has just completed the S-phase of its cell cycle, as compared to a gamete of the same species has:
| 1. | twice the number of chromosomes and twice the amount of DNA |
| 2. | the same number of chromosomes but twice the amount of DNA |
| 3. | twice the number of chromosomes and four times the amount of DNA |
| 4. | four times the number of chromosomes and twice the amount of DNA |
During which phase(s) of the cell cycle, amount of DNA in a cell remains at 4 C level if the initial amount is denoted as 2C:
1. G0 and G1
2. G1 and S
3. Only G2
4. G2 and M
In the 'S' phase of the cell cycle:
1. amount of DNA doubles in each cell.
2. amount of DNA remains the same in each cell
3. chromosome number is increased
4. amount of DNA is reduced to half in each cell.
The enzyme recombinase is required at which stage of meiosis:
1. Pachytene
2. Zygotene
3. Diplotene
4. Diakinesis
A stage in cell division is shown in the figure. Select the answer which gives the correct identification of the stage with its characteristics:
|
1. |
Late anaphase |
Chromosomes move away from the equatorial plate, Golgi complex not present |
|
2. |
Cytokinesis |
Cell plate formed, mitochondria distributed between two daughter cells |
|
3. |
Telophase |
Endoplasmic reticulum and nucleolus not reformed yet |
|
4. |
Telophase |
Nuclear envelop reforms, Golgi complex reforms |
The complex formed by a pair of synapsed homologous chromosomes is called:
1. Kinetochore
2. Bivalent
3. Axoneme
4. Equatorial plate
1. Zygotene
2. Pachytene
3. Diplotene
4. Leptotene
| 1. | kinetochore |
| 2. | both centromere and kinetochore |
| 3. | centromere, kinetochore and areas adjoining centromere |
| 4. | centromere |
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