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Question

Arrange the following events of meiosis in the correct sequence.
(i) Crossing over

(ii) Synapsis
(iii) Terminalization of chiasma
(iv) The disappearance of the nucleolus.

A
(ii),(i).(iv).(iii)
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B
(ii),(i).(iii).(i)
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C
(i),(ii).(iii).(iv)
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D
(ii),(iii).(iv).(i)
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Solution

The correct option is A (ii),(i).(iv).(iii)
  • Five stages of prophase include:-
1. Leptotene- condensation of chromatin or chromatin fibers.
2. Zygotene- synapsis occurs with synaptonemal complex being formed between homologous chromosomes.
3. Pachytene- crossing over of different chromatids
4. Diplotene- homologous chromosomes starts to separate from each other (disjunction), chiasmata appears (junction between chromosomes)
5. Diakinesis- chromosomes are fully condensed, nucleolus disappears and nuclear membrane disintegrates.
  • The correct answer is OPTION A.


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