In meiosis crossing over is initiated at 

1. leptotene

2. Zygotene

3. diplotene

4. pachytene

Arrange the following events of meiosis in correct sequences

1. II, I, IV, III
2. II, I, III, IV
3. I, II, III, IV
4. II, III, IV, I

During which phase(s) of cell cycle, the amount of DNA in a cell remain at 4C level if the

initial amount is denoted as 2C?

1. G₀ and G₁

2. G₁ and S

3. Only G₂

4. G₂ and M

The complex formed by a pair of synapsed homologous chromosomes is called 

1. equatorial plate

2. Kinetochore

3. bivalent

4. axoneme

A stage in cell division is shown in the figure. Select the answer which gives correct

identification of the stage with its characteristics.

During gamete formation, the enzyme recombinase participates during

1. Metaphase-I

2. Anaphase-II

3. Prophase-I

4. Prophase-II

Select the correct option with respect to mitosis.

1. Chromatids start moving towards opposite poles in telophase

2. Golgi complex and endoplasmic reticulum are still visible at the end of prophase

3. Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase

4. Chromatids separate but remains in the centre of the cell in anaphase

Given below is a schematic break-up of the phases/stages of the cell cycle

Which one of the following is the correct indication of the stage/phase in the cell cycle?

1. B-Metaphase

2. C-Karyokinesis

3. D-Synthesis phase

4. A-Cytokinesis 

Astral rays arise from 

When synapsis is complete all along the chromosome, the cell is said to have entered a stage called