In meiosis crossing over is initiated at 

1. leptotene

2. Zygotene

3. diplotene

4. pachytene

A somatic cell that has just completed the S-phase of its cell cycle, as compared to gamete of the same species has

1. twice the number of chromosomes and twice the amount of DNA

2. same number of chromosomes but twice the amount of DNA

3. twice the number of chromosomes and four times the amount of DNA

4. four times the number of chromosomes and twice the amount of DNA

In S-phase of the cell cycle 

1. amount of DNA doubles in each cell

2. amount of DNA remains same in each cell

3. chromosome number is increased

4. amount of DNA is reduced to half in each cell

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

identification of the stage with its characteristics.

1. Telophase       - Nuclear envelope reforms, Golgi complex reforms

2. Late anaphase -  Chromosomes move away from equatorial plate, Golgi complex not

present

3. Cytokinesis    -  Cell plate formed, mitochondria distributed between two daughter cells

4. Telophase      -  Endoplasmic reticulum and nucleolus not reformed yet

Given below is the representation of a certain event at a particular stage of a type of cell division. Which is this stage?

1. Prophase-I during meiosis

2. Prophase-II during meiosis

3. Prophase of mitosis

4. Both prophase and metaphase of mitosis

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 

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 

Which of the following is not a characteristic feature during mitosis in somatic cells
1. Disappearance of nucleolus

2. Chromosome movement

3. Synapsis

4. Spindle fibres

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that his cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in

(1) polyploidy

(2) somaclonal variation

(3) polyteny

(4) aneuploidy