NEET 2015
- Exam
- NEET
- Year
- 2015
- Subject
- Botany
- Chapter
- Cell Cycle and Cell Division
NEET 2015 · Botany · Cell Cycle and Cell Division
Arrange the following events of meiosis in the correct sequence: i....
Arrange the following events of meiosis in the correct sequence:
i. Crossing over
ii. Synapsis
iii. Terminalisation of chiasmata
iv. Disappearance of the nucleolus
i. Crossing over
ii. Synapsis
iii. Terminalisation of chiasmata
iv. Disappearance of the nucleolus
Options
- A(ii), (i), (iii), (iv)
- B(i), (ii), (iii), (iv)
- C(ii), (iii), (iv), (i)
- D(ii), (i), (iv), (iii)
Correct answer
A. (ii), (i), (iii), (iv)
Step-by-step solution
The sequence of event during meiosis are:
(A) Synapsis (Zygotene)- The homologous chromosomes start pairing with the help of the synaptonemal complex.
(B) Crossing over (Pachytene)- The non-sister chromatids of homologous chromosomes exchanges their parts. Enzyme recombinase takes part in this process.
(C) Terminalisation of chiasmata (Diakinesis)- The chiasmata moves towards the end of the chromosome (Telomere).
(D) The disappearance of nucleolus- The degeneration of nucleolus and nuclear membrane takes place which marks the end of prophase-I.