1. | Diakinesis | 2. | Zygotene |
3. | Pachytene | 4. | Diplotene |
A. | Tetrad formation is seen during Leptotene. |
B. | During Anaphase, the centromeres split and chromatids separate. |
C. | Terminalization takes place during Pachytene. |
D. | Nucleolus, Golgi complex and ER are reformed during Telophase. |
E. | Crossing over takes place between sister chromatids of homologous chromosome. |
1. | B and E only | 2. | A and C only |
3. | B and D only | 4. | A, C and E only |
1. | Pachytene | 2. | Diplotene |
3. | Diakinesis | 4. | Leptotene |
1. | (D), (B), (A), (E), (C) | 2. | (A), (B), (D), (E), (C) |
3. | (D), (A), (B), (E), (C) | 4. | (A), (D), (B), (C), (E) |
1. | Four haploid cells are formed at the end of Meiosis-II. |
2. | There are two stages in Meiosis, Meiosis-I and II. |
3. | DNA replication occurs in S phase of Meiosis-II. |
4. | Pairing of homologous chromosomes and recombination occurs in Meiosis-I. |
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 |
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). |
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)