Diakinesis

Q.

What is chiasma in meiosis?

Q. Zygotene of prophase I is characterized by

1. crossing over
2. chromomeres
3. synaptonemal complex
4. terminalisation of chiasmata

Q. Terminalisation occurs during:

1. Diakinesis
2. Mitosis
3. Meiosis II
4. Cytokinesis

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

1. E → D → C → B → A
2. C → B → E → A → D
3. A → B → C → D → E
4. C → B → D → E → A

Q.

What marks the end of prophase in mitosis?

Q. Match the following:

$\begin{array}{cccc}& \text{Column A}& & \text{Column B}\\ \text{A}& \text{Diplotene}& \text{i}& \text{Appearance of recombination nodule and recombination between homologous chromosomes}\\ \text{B}& \text{Diakinesis}& \text{ii}& \text{Dissolution of the synaptonemal complex and formation of the chiasmata}\\ \text{C}& \text{Zygotene}& \text{iii}& \text{Compaction of chromosomes}\\ \text{D}& \text{Pachytene}& \text{iv}& \text{Terminalisation of the chiasmata}\\ \text{E}& \text{Leptotene}& \text{v}& \text{Synapsis and formation of the bivalent}\end{array}$

1. A-ii; B-iv; C-v; D-i; E-iii
2. A-ii; B-v; C-iv; D-iii; E-i
3. A-v; B-iv; C-i; D-ii; E-iii
4. A-i; B-iv; C-iii; D-ii; E-v

Q.

Do primary Spermatocytes undergo mitosis?

Q. How many sperms and ova will be formed by a primary spermatocyte and a primary oocyte respectively?

1. One, One
2. One, Four
3. Four, One
4. Four, Four

Q. Which stage in prophase I of meiosis is characterised by the appearance of the recombination nodules?

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

Q.

What happens during Meiosis-I and Meiosis-II?

Q.

Why is the pachytene stage referred to as the tetrad stage?

Q.

Cristae are associated with what?

Q. Given below is the representation of a certain event at a particular stage of a type of cell division. Which is this stage?

1. Prophase of Mitosis
2. Both prophase and metaphase of mitosis
3. Prophase I during meiosis
4. Prophase II during meiosis

Q. Polytene chromosomes are formed due to

1. Duplication without separation
2. Endoduplication
3. Replicatin of DNA without cell division
4. All of the above

Q. What would happen, if the vertebrate mitochondrial DNA undergoing the process of translation and forming a polypeptide, a sudden mutation changes the ${25}^{\mathrm{th}}$ codon of the mRNA into UGA?

1. The ribosome will read over the mutated codon and continue the synthesis of the polypeptide
2. The ribosome will stop at the mutated codon and synthesise a polypeptide of 25 amino acids
3. The ribosome will stop at the mutated codon and synthesise a polypeptide of 24 amino acids
4. Polypeptide synthesis will not occur at all

Q.

When does meiotic recombination begin?

Q. Arrange the following events of meiosis I in the correct order:
(i) Diplotene
(ii) Pachytene
(iii) Zygotene
(iv) Diakinesis
(v) Leptotene

1. (i); (ii); (iii); (iv); (v)
2. (v); (iii); (ii); (i); (iv)
3. (ii); (iii); (i); (v); (iv)
4. (i); (iii); (ii); (v); (iv)

Q. Assertion :The lampbrush chromosomes are called diplotene chromosomes bivalents.
Reason: The number of loops is maximum during diplotene.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Arrange the following events of meiosis in correct sequence:

I. Terminalisation

II. Crossing over

III. Synapsis

IV. Disappearance of nucleolus

1. I, IV, III, II
2. IV, III, II, I
3. III, II, I, IV
4. II, I, IV, III

Q. Terminalisation occurs during:

1. Diakinesis
2. Mitosis
3. Meiosis II
4. Cytokinesis

Q. If an organism is a diploid (or 2n) with 16 chromosomes, then how many chromosomes its sperm cells or egg cells will contain?

1. 8
2. 16
3. 32
4. 64

Q. In the beginning of meiosis, a meiocyte has 16 pg of DNA. the amount in a gamete will be.........[wardha 2003]

1. 16 peg
2. 8 pg
3. 4 pg
4. 32 pg

Q. In meiosis, nuclear membrane and nucleolus disappear during

1. Pachytene
2. Diakinesis
3. Zygotene
4. Metaphase- I

Q. The re-organisation of genetic material or genetic recombination occurs during

1. Mitosis
2. Meiosis
3. Metamorphosis
4. Organogenesis

Q. Terminalization occurs during

1. Mitosis
2. Cytokinesis
3. Meiosis I
4. Diakinesis

Q.

Match the substages of prophase I of first meiotic division listed in column I with the important events pertaining to respective stages given under column II; choose the answer which gives the correct combination of alphabets of the two columns:

$\begin{array}{cccc}& ColumnISubstagesofprophaseI& & ColumnIIImportantevents\\ A& \text{Zygotene}& p& \text{Chromomeres}\\ B& \text{Pachytene}& q& \text{Bivalents migrate to periphery}\\ C& \text{Diplotene}& r& \text{Terminalization of chiasmata begins}\\ D& \text{Diakinesis}& s& \text{Crossing over}\\ & & t& \text{Synapsis}\end{array}$

1. A = t, B = s, C = r, D = q

2. A = p, B = s, C = r, D = q

3. A = s, B = p, C = r, D = q

4. A = s, B = t, C = r, D = q

Q. The nuclear envelope disappears and reappears respectively during ________.

1. telophase and metaphase
2. telophase and prophase
3. prophase and telophase
4. prophase and anaphase

Q. The given diagram represents a dividing cell stained with giemsa. From the options given below, identify the correct stage of cell division.

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

Q. Terminalisation occurs during:

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

Q. A. Appearance of homologous chromosome
B. Formation of bivalent
C. Synapsis
D. Recombination
E. Movement of chiasmata
F. Chiasma formation
G. Disappearance of nucleolus

In given statements, what is the correct sequence of the process of meiosis?

1. A →B →D →G →F →C →E
2. E →C →D →G →F →A →B
3. A →C →B →D →F→E → A
4. B →C →D →G →F →A → E