In meiosis crossing over is initiated at
1. leptotene
2. Zygotene
3. diplotene
4. pachytene
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 |
During cell growth, DNA synthesis takes place in
1. S-phase
2. -phase
3. -phase
4. M-phase
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 |
1. | leptotene | 2. | zygotene |
3. | diplotene | 4. | pachytene |