Find the correctly matched pairs and choose the correct option.
A. Zygotene – Pairing of homologous chromosomes
B. Leptotene – Dissolution of the complex synaptonemal takes place
C. Diplotene – Bivalent chromosomes appear as dyad
D. Diakinesis – Terminalization of chiasmata takes place

A and C

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B and C

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A and B

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A and D

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Solution

The correct option is D A and D
Pachytene is characterised by the occurrence of crossing over of homologous chromosomes forming bivalent chromosomes. Bivalent chromosomes appear as tetrads. Diplotene stage follows pachytene and it involves the dissolution of synaptonemal complexes.

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\begin{matrix} Column A & Column B A & Diplotene & i & Appearance of recombination nodule and recombination between homologous chromosomes B & Diakinesis & ii & Dissolution of the synaptonemal complex and formation of the chiasmata C & Zygotene & iii & Compaction of chromosomes D & Pachytene & iv & Terminalisation of the chiasmata E & Leptotene & v & Synapsis and formation of the bivalent \end{matrix}

(a)	Zygotene	(i)	Condensation of chromatin begins
(b)	Leptotene	(ii)	Dissolution of synaptonemal complex
(c)	Diplotene	(iii)	Synapsis
(d)	Diakinesis	(iv)	Terminalisation of chiasmata

(a) Pachytene	(i) Pairing of homologous chromosomes
(b) Metaphase I	(ii) Terminalisation of chiasmata
(c) Diakinesis	(iii) Cross-over takes place
(d) Zygotene	(iv) Chromosomes align at equatorial plate

\begin{matrix} Column-I & Column-II (a) & Zygotene & (i) & Recombination between homologous chromosomes (b) & Diplotene & (ii) & Formation of synaptonemal complex (c) & Pachytene & (iii) & Terminalisation of chiasmata (d) & Diakinesis & (iv) & Chiasmata formation \end{matrix}

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