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

1. Anaphase

2. Telophase

3. Prophase

4. Metaphase

In a mitotic cycle, the correct sequence of phases is

1. S, ${\mathrm{G}}_1$, ${\mathrm{G}}_2$, M

2. ${\mathrm{G}}_1$, S, ${\mathrm{G}}_2$, M

3. M, ${\mathrm{G}}_1$, ${\mathrm{G}}_2$, S

4. ${\mathrm{G}}_1$, ${\mathrm{G}}_2$, S, M

During Meiosis 1, in which stage synapsis takes place?

1. Pachytene

2. Zygotene

3. Diplotene

4. Leptotene

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)

Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres :
1.  Metaphase-II
2.  Anaphase-I
3.  Anaphase-II
4.  Metaphase-I

At metaphase, chromosomes are attached to the
spindle fibres by their :
1. Centromere
2. Satellites
3. Secondary constrictions
4. Kinetochores

Centromere is required for -

(1) Movement of chromosomes towards poles

(2) Cytoplasmic cleavage

(3) Crossing over

(4) Transcription

What occurs in crossing over :
1.  Recombination
2.  Mutation
3.  Independent assortment
4.  None

Crossing over that results in genetic recombination in higher organisms occurs between:-
1. Non-sister chromatids of a bivalent
2. Two daughter nuclei
3. Two different bivalents
4. Sister chromatids of a bivalents 

In the somatic cell cycle :-

1. DNA replication takes place in S-phase

2. A short interphase is followed by a long mitotic phase

3. $G_2$ phase follows mitotic phase

4. In $G_1$ phase, DNA content is double the amount of DNA present in the original cell