Diplotene

Q.

How many daughter cells are produced from meiosis of one parent cell?

Q.

Is crossing over and recombination the same thing?

Q.

The study of chromosomes at meiotic diplotene shows that:

1. The homologous chromosomes remain united by chiasmata
2. The intimately paired chromosomes completely separate from each other
3. The pairing of homologous chromosomes which had initiated in the earlier stage is completed
4. None of the above

Q.

The stage during which separation of the paired homologous chromosome begins is:

1. Zygotene

2. Pachytene

3. Diplotene

4. Diakinesis

Q.

What Is the purpose of Meiosis I and II?

Q. Colchicine prevents the mitosis of cells at which of the following stages?

1. Anaphase
2. Metaphase
3. Prophase
4. Interphase

Q. Chiasmata in cell division is seen in

1. Leptotene
   
2. Zygotene
   
3. Pachytene
   
4. Diplotene

Q.

What are the advantages of crossing over and recombination?

Q.

What is the metaphase plate?

Q. Crossing over occurs during the pachytene stage of prophase in meiosis, however the chiasma are visible during

1. Zygotene
2. Pachytene
3. Leptotene
4. Diplotene

Q.

What are Isogametes?

Q.

Which phase is of longest duration in meiosis?

1. Prophase-II

2. Metaphase-I

3. Anaphase-I

4. Prophase-I

Q.

Separation of homologous chromosomes is known as:

1. Dispersion

2. Crossing over

3. Disjunction

4. Bivalent formation

Q. Find the correctly matched pairs and choose the correct option.
A. Zygotene – Pairing of homologous chromosomes
B. Pachytene – Dissolution of the complex synaptonemal takes place
C. Diplotene – Bivalent chromosomes appear as tetrads
D. Diakinesis – Terminalization of chiasmata takes place

1. A and B
2. B and C
3. A and C
4. A and D

Q.

Bateson used the terms coupling and repulsion for linkage and crossing over. Name the correct parental or coupling type along with its cross over or repulsion.

A) Coupling AABB, aabb ; Repulsion AABB, AAbb

B) Coupling AAbb, aaBB ; Repulsion AaBb, aabb

C) Coupling aaBB, aabb ; Repulsion AABB, aabb

D) Coupling AABB, aabb ; Repulsion AAbb, aaBB

Q.

Question 39
What are the various stages of meiotic prophase-I? Enumerate the chromosomal events during each stage?

Q.

Why is Chargaffs rule important to DNA?

Q.

What happens to homologous chromosomes in the meiotic prophase?

Q. Chiasmata is (i)___________ and it is formed during the (ii)___________ stage of meiosis.

1. (i) - the X-shaped structure formed when the synaptonemal complex dissolves and the homologous chromosomes remain attached at site of crossover
   (ii) - zygotene
   
2. (i) - the structure formed by the pairing of homologous chromosomes during synapsis
   (ii) - diplotene
   
3. (i) - the structure formed by the pairing of homologous chromosomes during synapsis
   (ii) - zygotene
   
4. (i) - the X-shaped structure formed when the synaptonemal complex dissolves and the homologous chromosomes remain attached at site of crossover
   (ii) - diplotene
   

Q.

Question 36
Name a cell that is found arrested in diplotene stage for months and years. Comment in 2-3 lines how it completes cell cycle?

Q. The triploid number of chromosome of the first taxon is 10 times more than the haploid number of the chromosomes of the second taxon, while the diploid of the third taxon is 6 times more than the hapoid number of the fourth taxon. Which one of the following show the ascending order of the number of the chromosome in their respective endosperm? n ntA)Oryza-Allium-Saccharum-Nicotiana n ntB)Allium- Oryza-Nicotiana-Saccharum n ntC)Nicotiana-Saccharum-Oryza-Allium n ntD)saccharum-Oryza-Nicotiana-Allium

Q. What are homologous chromosomes? Name the stage of cell division in which paired homologous chromosomes get shortened & thickened. What happen to homologous chromosomes during meiosis?

Q. The gap or stage of Meiosis, before Meiosis II begins, is also called as _______.

1. Interphase
2. Interkinesis
3. G${}_0$ Phase
4. G Phase

Q.

At which stage, the homologous chromosomes separate due to repulsion, but are held together by the chiasmata?

1. Zygotene

2. Diplotene

3. Pachytene

4. Diakinesis

Q. Complete linkage is found in

1. Snakes
2. Birds
3. Male Drosophila
4. Female Drosophila

Q. The study of external structure of a plant is called

1. Histology
2. Morphology
3. Taxonomy
4. Phyllotaxy

Q. explain in details aboutformation of 1st recombinant DNA

Q. Chiasmata are formed during

1. Zygotene
2. Diplotene
3. Pachytene
4. Leptotene

Q. Lampbrush chromosomes are seen in which typical stage?

1. Mitotic metaphase
2. Meiotic prophase
3. Mitotic anaphase
4. Mitotic prophase

Q. First polar body is formed during the formation of _______ and completion of ___ meiotic division.

1. primary spermatocytes, first
2. secondary spermatocytes, second
3. primary oocytes, second
4. secondary oocytes, first