Q16 / 180 · NEET 2015 (Phase 2) · Botany

Arrange the following events of meiosis in the correct sequence:

i. Crossing over

ii. Synapsis

iii. Terminalisation of chiasmata

iv. Disappearance of the nucleolus

  • Correct answer
    A
    (ii), (i), (iii), (iv)
  • B
    (i), (ii), (iii), (iv)
  • C
    (ii), (iii), (iv), (i)
  • D
    (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.

Hence, the correct answer is option: 'A'.

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