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

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

(1) Diakinesis

(2) Pachytene

(3) Leptotene

(4) Zygotene

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

Match the following events that occur in their respective phases of cell cycle and select the correct option :

(a) G 1 phase                      (i) Cell grows and organelle duplication

(b) S phase                         (ii) DNA replication and chromosome duplication

(c) G 2 phase                       (iii) Cytoplasmic growth

(d) Metaphase in M-phase     (iv) Alignment of chromosomes

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

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

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

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

During Meiosis 1, in which stage synapsis takes place?

1. Pachytene

2. Zygotene

3. Diplotene

4. Leptotene

Attachment of spindle fibers to kinetochores of chromosomes becomes evident in :

1. Anaphase

2. Telophase

3. Prophase

4. Metaphase