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 |
1. G1/S
2. G2 /M
3. M
4. Both G2/M and M
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 |
Anaphase Promoting Complex (APC) is protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?
1. Chromosomes will be fragmented
2. Chromosomes will not segregate
3. Recombination of chromosome arms will occur
4. Chromosomes will not condense
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. | Pachytene | 2. | Diplotene |
3. | Diakinesis | 4. | Zygotene |
During cell growth, DNA synthesis takes place in:
1. S phase
2. G1 phase
3. G2 phase
4. M phase
In meiosis crossing over is initiated at
1. leptotene
2. Zygotene
3. diplotene
4. pachytene