Cell Cycle and Cell Division

The stage during which separation of the paired homologous chromosomes begins is

1. zygotene
2. pachytene
3. diplotene
4. diakinesis

Which of the following options gives the correct sequence of events during mitosis?

1. Condensation Nuclear membrane disassembly Arrangement at equator Centromere division Segregation Telophase
2. Condensation Crossing over Nuclear membrane disassembly Segregation Telophase
3. Condensation Arrangement at equator Centromere division Segregation Telophase
4. Condensation Nuclear membrane disassembly Crossing over Segregation Telophase

Anaphase Promoting Complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cell. 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.

Spindle fibres attach on to

1. centromere of the chromosome
2. kinetosome of the chromosome
3. telomere of the chromosome
4. kinetochore of the chromosome.

Which of the following is not a characteristic feature during mitosis in somatic cells?

1. Chromosome movement
2. Synapsis
3. Spindle fibres
4. Disappearance of nucleolus

In meiosis crossing over is initiated at

1. zygotene
2. diplotene
3. pachytene
4. leptotene.

During cell growth, DNA synthesis takes place on

1. S-phase
2. G1-phase
3. G2-phase
4. M phase

When cell has stalled DNA replication fork, which checkpoint should be predominantly activated?

1. G1/S
2. G2/M
3. M
4. Both G2/M and M

Match the stages of meiosis in column I to their characteristic features in column II and select the correct option using the codes given below.

1. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
2. (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
3. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
4. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

Arrange the following events of meiosis in correct sequence (i) Crossing over (ii) Synapsis (iii) Terminalisation of chiasmata (iv) Disappearance of nucleolus

1. (i), (ii), (iii), (iv)
2. (ii), (iii), (iv), (i)
3. (ii), (i), (iv), (iii)
4. (ii), (i), (iii), (iv)