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Diplotene

Chiasmata in ...

Question

Chiasmata in cell division is seen in

A

Leptotene

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B

Zygotene

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C

Pachytene

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D

Diplotene

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Solution

The correct option is D Diplotene
Chiasmata is defined as the point of contact or the physical link, between two chromatids belonging to homologous chromosomes.
At a given chiasma, an exchange of genetic material occurs between both chromatids, which is called a chromosomal crossover.
The chiasmata become visible during the diplotene stage of prophase I of meiosis. but the actual "crossing-over" of genetic material is thought to occur during the pachytene stage.

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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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c) Leptotene

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Q. Arrange the following events of meiosis I in the correct order:
(i) Diplotene
(ii) Pachytene
(iii) Zygotene
(iv) Diakinesis
(v) Leptotene

Q. Prophase of the first meiotic division is typically longer and complex. It is subdivided into

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phases: leptotene, zygotene, pachytene, diplotene and diakinesis. Which of the following statements is not correct of these phases?

Q. Match the following:

	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

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