Question

Arrange the chromosomal events of meiosis in correct sequence:

List:
I) Disappearing of nucleolus
II) Appearance of recombination nodule on chromatids
III) Terminalisation of chiasmata
IV) Pairing of chromosomes
V) Dissolution of synaptonemal complex

• A. II, III, IV, I, V
• B. I, V, II, IV, III
• C. IV, III, II, V, I
• D. IV, II, V, III, I

Hint:

Zygotene (pairing) → Pachytene (crossing over) → Diplotene (synaptonemal dissolution) → Diakinesis (chiasmata terminalise) → Metaphase prep.

Answer 1

The Correct Option is D

Step 1: IV - Pairing of chromosomes (synapsis begins in zygotene)
Step 2: II - Appearance of recombination nodule (in pachytene, where crossing over begins)
Step 3: V - Dissolution of synaptonemal complex (in diplotene)
Step 4: III - Terminalisation of chiasmata (during diakinesis)
Step 5: I - Disappearance of nucleolus (prepares for metaphase I)

Thus, the correct sequence is IV, II, V, III, I.