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 |
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)
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