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

A and C

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A and D

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A and B

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B and C

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Solution

The correct option is B A and D
Pachytene is characterized by occurrence of crossing over. Bivalent chromosomes now clearly appear as tetrads. Diplotene follows pachytene and involves dissolution of synaptonemal complex.

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Similar questions

	Column I		Column II
A	Leptotene	1	Terminalisation of chiasmata
B	Zygotene	2	Dissolution of the synaptonemal complex
C	Pachytene	3	Crossing over takes place
D	Diplotene	4	Formation of synaptonemal complex
E	Diakinesis	5	Condensation of chromosome

(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 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. Pachytene	1. Pairing of homologous chromosomes
b. Metaphase I	2. Terminalization of chiasmata
c. Diakinesis	3. Crossing-over takes place
d. Zygotene	4. 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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