Telophase I

Q.

How many meiotic divisions of PMC are required to produce 1000 pollen grains?

1. 250

2. 200

3. 500

4. 100

Q. Select the incorrect statement with respect to the cell cycle.

1. At the end of telophase-I, chromosome number is reduced to half
2. Duplication of genes occurs twice in meiosis
3. Karyokinesis occurs twice during meiotic division
4. Cyclins are proteins that activate protein kinases to regulate the cell cycle

Q.

How many cells will be produced if a cell divides mitotically four times?

1. 24

2. 16

3. 32

4. 64

Q.

Bouquet stage is observed in____________ stage of the cell division.

1. Diplotene

2. Pachytene

3. Leptotene

4. Zygotene

Q.

No. of meiotic divisions required to produce 200/400 seeds of pea would be

A.200/400

B.400/800

C.300/600

D.250/500

Q.

What can happen if there is a failure in the process of cell division after DNA replication?

Q. When the cell has stalled DNA replication, which checkpoint should be predominantly activated?

1. $G_1$/S
2. $G_2$/$G_0$
3. $G_2$/M
4. M

Q. The diagram opposite show a pair of homologous chromosomes during meiosis-


Maximum crossing over will occur between which genes.

1. A and b
2. B and c
3. c and D
4. A and d

Q.

The enzyme recombinase is required at which stage of meiosis?

1. Pachytene

2. Zygotene

3. Diplotene

4. Diakinesis

Q. Arrange the following events of meiosis in the correct sequence -
A. Terminalisation of chiasmata
B. Crossing over
C. Synapsis
D. Disjunction of chromosomes
E. Dissolution of synaptonemal complex
The correct sequence is-

1. $A\to B\to C\to D\to E$
2. $E\to D\to C\to B\to A$
3. $C\to B\to D\to E\to A$
4. $C\to B\to E\to A\to D$

Q. Match the following processes of meiosis I to their descriptions.

1. Crossing over
2. Equatorial plate
3. Homologues separate
4. Haploid dyad

Q. You have studied mitosis in onion root tip cells. It has 16 chromosomes in each cell. Can you tell:
(ii) Also, what will be the DNA content of the cells at $G_1$, after S and at $G_2$, if the content after M phase is 2C?

Q. Select the incorrect statement with respect to the cell cycle.

1. Duplication of genes occurs twice in meiosis
2. Karyokinesis occurs twice during meiotic division
3. Cyclins are proteins that activate protein kinases to regulate the cell cycle
4. At the end of telophase-I, chromosome number is reduced to half

Q. In wheat how many meiotic cell divisions are required to produce 200 grams?

1. 200
2. 250
3. 400
4. 50

Q. If the DNA content of a cell in G${}_1$ phase is 4C, what would be its DNA content in G${}_2$ phase?

1. 1C
2. 2C
3. 4C
4. 8C

Q. Homologous chromosomes move toward opposite poles of a dividing cell during

1. mitosis
2. meiosis I
3. meiosis II
4. fertilization

Q. Telophase I:

1. crossing over occurs.
2. chromosomes align on the central plane.
3. one version of each chromosome moves to a pole of the cell.
4. chromosomes gather at the two poles of the cell.

Q. Telophase I:

1. chromosomes gather at the two poles of the cell.
2. crossing over occurs.
3. chromosomes align on the central plane.
4. one version of each chromosome moves to a pole of the cell.

Q. During synapsis the number of fibre in each chromosome is?

1. $2$
2. $4$
3. $8$
4. Many

Q. During telophase I

1. homologous chromosome pairs reach the poles of the cell
2. all of the above
3. nuclear envelopes form around the chromosome at the poles
4. cytokinesis occurs

Q. End of prophase is marked by?

1. Initiation of condensation of chromosomal material
2. Complete disintegration of nuclear membrane
3. Reappearance of ER, Golgi body, nucleolus and nuclear envelop
4. Alignment of chromosomes at the equator

Q. The sister chromatids of a chromosomes are joined at

1. Centromere
2. Satellite
3. Chromocentre
4. Telomere

Q. Which of the following statements correctly explains why gametes are considered to be haploid at the end of Meiosis I?

1. Crossing over occurs in prophase I and this process only occurs in haploid cells
2. The homologous pairs pull apart at anaphase I, and this creates haploid cells
3. Sister chromatids separate at the end of telophase I, making the cells haploid
4. When tetrads line up along the metaphase plate in metaphase I, this creates haploid cells
5. Homologous pairs separate at the end of telophase I, making the cells haploid

Q. During the pairing of chromosomes in meiosis, the ............... chromosomes come to lie side by side

1. The autosomal
2. Homologous
3. Sister
4. Sex Chromosomes

Q. Select the incorrect statement with respect to the cell cycle.

1. Duplication of genes occurs twice in meiosis
2. Karyokinesis occurs twice during meiotic division
3. Cyclins are proteins that activate protein kinases to regulate the cell cycle
4. At the end of telophase-I, chromosome number is reduced to half

Q. Arrange the following events in the correct sequence of their occurrence during meiosis.
a) Formation of a recombination nodule
b) Reduction in the number of chromosomes
c) Alignment of univalents at the equator
d) Terminalisation of chaismata

1. a, d, b, and c
2. c, d, b and a
3. a, c, b and d
4. a , b , d and c

Q. In meiosis I, the centromere undergoes

1. No division
2. Division between prophase and metaphase
3. Division but the daughter chromosomes do not separate
4. Division between anaphase and interphase

Q. Homologous chromosomes move toward opposite poles of a dividing cell during

1. meiosis I
2. mitosis
3. meiosis II
4. fertilization

Q. Genetic content of a cell reduces to half during

1. Meiotic prophase I
2. Mitotic prophase
3. Meiotic prophase II
4. Meiotic telophase

Q. Match the following processes of meiosis I to their descriptions.

1. Crossing over
2. Equatorial plate
3. Homologues separate
4. Haploid dyad