NEET2015BotanyCell Cycle and Cell DivisionActual
Arrange the following events of meiosis in the correct sequence: 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 whic