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Prophase I

Prophase of t...

Question

Prophase of the first meiotic division is typically longer and complex. It is subdivided into $5$ phases: leptotene, zygotene, pachytene, diplotene and diakinesis. Which of the following statements is not correct of these phases?

The formation of synaptonemal complex is seen during zygotene stage.

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The stage of pachytene is characterized by appearance of recombination nodules.

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Diplotene stage is marked by terminalisation of chiasmata.

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The compaction of chromosomes continues throughout the leptotene.

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Solution

The correct option is C Diplotene stage is marked by terminalisation of chiasmata.
Meiosis is the type of division in which a diploid cell divides to give rise to four haploid gametes. The terminalization of chiasmata takes place during the diakinesis stage of meiosis, not j the diplotene stage.
So, the correct answer is 'Diplotene stage is marked by terminalisation of chiasmata.'

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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

Regarding the assertion and reason; choose the correct option_____.

Assertion [A]: Prophase I of Meiosis I is the longest phase during the formation of gametes.

Reason [R]: It has five sub-stages Leptotene, Zygotene, Pachytene, Diplotene and

Diakinesis; during which the number of chromosomes is doubled.

Z y g o t e n e \to L e p t o t e n e \to P a c h y t e n e \to D i p l o t e n e \to D i a k i n e s i s

D i a k i n e s i s \to Z y g o t e n e \to L e p t o t e n e \to P a c h y t e n e \to D i p l o t e n e

L e p t o t e n e \to Z y g o t e n e \to P a c h y t e n e \to D i p l o t e n e \to D i a k i n e s i s .

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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}

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