During cell growth, DNA synthesis takes place in
(1) S-phase
(2) -phase
(3) -phase
(4) M-phase
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
During cell growth, DNA synthesis takes place in:
1. S phase
2. G1 phase
3. G2 phase
4. M phase
1. | Pachytene | 2. | Diplotene |
3. | Diakinesis | 4. | Zygotene |
Which of the following options gives the correct sequence of events during mitosis?
1. | Condensation, nuclear membrane disassembly, arrangement at the equator, centromere division, segregation, telophase |
2. | Condensation, crossing over, nuclear membrane disassembly, segregation, telophase |
3. | Condensation, centromere division, segregation, arrangement at the equator, telophase |
4. | Condensation, nuclear membrane disassembly, crossing over, segregation, telophase |
Column I | Column II | ||
(a) | pachytene | (1) | pairing of homologous chromosomes |
(b) | metaphase I | (2) | terminalisation of chiasmata |
(c) | diakinesis | (3) | crossing-over takes place |
(d) | zygotene | (4) | chromosomes align at equatorial plate |
1. | Disappearance of nucleolus | 2. | Chromosome movement |
3. | Synapsis | 4. | Spindle fibres |
1. | kinetochore of the chromosome |
2. | centromere of the chromosome |
3. | kinetosome of the chromosome |
4. | telomere of the chromosome |