Q. No.Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):
The beginning of diplotene is recognised by the dissolution of the synaptonemal complex and formation of X shaped structures called chiasmata
Reason (R):
In oocytes of some vertebrates, diplotene can last for months or years.
In the light of the above statements, choose the correct answer from the options given below:
1.
(A) is correct but (R) is not correct.
2.
(A) is not correct but (R) is correct.
3.
Both (A) and (R) are correct and (R) is the correct explanation of (A).
4.
Both (A) and (R) are correct but (R) is not the correct explanation of (A).
In the light of the above statements, choose the correct answer from the options given below:
The oocytes of some vertebrates get arrested for years or months in:
| 1. | Telophase - I | 2. | Diplotene |
| 3. | Diakinesis | 4. | Metaphase - I |
Select the correct sequence of events occurring during Prophase-I of Meiosis-I:
| (a) | Nuclear envelope breakdown |
| (b) | Synaptonemal complex formation |
| (c) | Compaction of chromosomes |
| (d) | Terminalisation of chiasmata |
| (e) | Crossing over |
Choose the most appropriate answer from the options given below:
1. (c) → (b) → (e) → (d) → (a)
2. (c) → (a) → (b) → (d) → (e)
3. (b) → (c) → (a) → (d) → (e)
4. (c) → (a) → (b) → (e) → (d)
1. Leptotene
2. Pachytene
3. Diplotene
4. Diakinesis
1. Phosphorylase
2. Recombinase
3. Transferase
4. Polymerase
| a. | Synapsis of homologous chromosomes |
| b. | Chromosomes become gradually visible under a microscope |
| c. | Crossing over between non-sister chromatids of homologous chromosomes |
| d. | Terminalisation of chiasmata |
| e. | Dissolution of synaptonemal complex |
Choose the correct answer from the options given below:
| 1. | (a), (b), (c), (d), (e) | 2. | (b), (c), (d), (e), (a) |
| 3. | (b), (a), (c), (e), (d) | 4. | (a), (c), (d), (e), (b) |
| 1. | Synaptonemal complex in the zygotene stage |
| 2. | Chiasmata in the diplotene stage |
| 3. | Synaptonemal complex in the pachytene stage |
| 4. | Chiasmata in the zygotene stage |
| 1. | Complete disintegration of nuclear envelope takes place. |
| 2. | Chromosomes are highly condensed. |
| 3. | Metaphase chromosomes are made up of four sister chromatids held together by centromere. |
| 4. | Chromosomes lie at the equator of the cell. |
Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R)
| Assertion (A): | The growth of the multicellular organism is due to mitosis |
| Reason (R): | Mitosis is also called as equational division and it offers genetic stability |
In light of the above statements choose the correct answer from the options given below:
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
In prophase I of Meiosis, chromosomes start pairing together and synapsis takes place. This process occurs during which of the following stage?
| 1. | Pachytene | 2. | Diplotene |
| 3. | Leptotene | 4. | Zygotene |
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