Arrange the following events of meiosis in the correct sequence: i. Crossing over ii. Synapsis iii.…

Arrange the following events of meiosis in the correct sequence:
i. Crossing over
ii. Synapsis
iii. Terminalisation of chiasmata
iv. Disappearance of the nucleolus
  1. (ii), (i), (iii), (iv)
  2. (i), (ii), (iii), (iv)
  3. (ii), (iii), (iv), (i)
  4. (ii), (i), (iv), (iii)

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.

Asked in: NEET 2015 (Phase 2)

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