If the DNA content of an onion tip cell is 2C at the end of the M-phase, what would be its DNA content at the end of the S-phase?
1. C
2. 2C
3. 3C
4. 4C
In oocyte of some vertebrates, the stage of meiosis I that can last for months or years would be:
1. Zygotene
2. Pachytene
3. Diplotene
4. Diakinesis
When a cell stops growing, say due to shortage of nutrients, this will occur in which phase of the cell cycle?
1.
2.
3. S
4.
The following cell undergoing mitosis, is at:
1. | Early prophase | 2. | Late prophase |
3. | Transition to metaphase | 4. | Early metaphase |
Which of the following options gives the correct sequences of events during mitosis?
(1) Condensation → nuclear membrane disassembly → crossing over → Segregation → telophase
(2) Condensation → nuclear membrane disassembly → arrangement at equator → centromere division → Segregation → telophase
(3) Condensation → crossing over → nuclear membrane disassembly → Segregation → telophase
(4) Condensation → arrangement at equator → centromere division → Segregation → telophase
During cell growth, DNA synthesis takes place in
(1) S-phase
(2) -phase
(3) -phase
(4) M-phase
Which of the following is not a characteristic feature during mitosis in somatic cells
1. Disappearance of nucleolus
2. Chromosome movement
3. Synapsis
4. Spindle fibres
Spindle fibres attach on to
1. Kinetochore of the chromosome
2. centromere of the chromosome
3. Kinetosome of the chromosome
4. telomere of the chormosome
In meiosis crossing over is initiated at
1. leptotene
2. Zygotene
3. diplotene
4. pachytene
Arrange the following events of meiosis in correct sequences
I. Crossing Over
II. Synapsis
III. terminalisation of chaismata
IV. Disapperance of nucleolus
(1) II, I, IV, III
(2) II, I, III, IV
(3) I, II, III, IV
(4) II, III, IV, I