Which stage of meiotic prophase shows terminalisation of chiasmata as its distincitve feature?

(1) Diakinesis

(2) Pachytene

(3) Leptotene

(4) Zygotene

The fruit fly has 8 chromosomes (2n) in each cell. During the interphase of Mitosis if the number of chromosomes at G₁ phase is 8, what would be the number of chromosomes after the S phase? 

1. 4

2. 32

3. 8

4. 16

The centriole undergoes duplication during:

(1) Metaphase

(2) G₂ phase

(3) S-phase

(4) Prophase

Match List-I with List-II

Choose the correct answer from the options given below.

    (a) (b) (c) (d)

1. (iv) (i) (ii) (iii)

2. (ii) (iv) (iii) (i)

3. (iii) (ii) (i) (iv)

4. (iv) (ii) (iii) (i)

Which of the following stages of meiosis involves division of centromere?

(1) Anaphase II

(2) Telophase II

(3) Metaphase I

(4) Metaphase II

In which stage of cell cycle, DNA replication occurs :
1. G₁ - phase
2. S - phase
3. G₂ - phase
4. M - phase

Best material for the study of mitosis in laboratory : -

(1) Anther

(2) Root tip

(3) Leaf tip

(4) Ovary

Spindle fibre unites with which structure of chromosomes :
1. Chromocenter
2. Chromomere
3. Kinetochore
4. Centriole

If you are provided with root-tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?

1. Telophase

2. Anaphase

3. Prophase

4. Metaphase 

Amount of cellular DNA increases during :
1.  Cytokinesis
2.  Fertilisation
3.  Mutation
4.  Respiration