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Question

Arrange the following events of meiosis I in the correct order:
(i) Diplotene
(ii) Pachytene
(iii) Zygotene
(iv) Diakinesis
(v) Leptotene

A
(i); (ii); (iii); (iv); (v)
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B
(v); (iii); (ii); (i); (iv)
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C
(ii); (iii); (i); (v); (iv)
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D
(i); (iii); (ii); (v); (iv)
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Solution

The correct option is B (v); (iii); (ii); (i); (iv)
Prophase I of meiosis I has the following stages:
  • Leptotene - Compaction of chromosomes
  • Zygotene - Synapsis of homologous chromosomes, formation of the bivalent (tetrad) and the synaptonemal complex
  • Pachytene - Crossing over of non-sister chromatids of homologous chromosomes and recombination of genetic material
  • Diplotene - Dissolution of the synaptonemal complex and formation of the chiasmata
  • Diakinesis - Terminalization of chiasmata and assembly of the meiotic spindle.

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