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Cytokinesis

During Meiosi...

Question

During Meiosis I, the chromosomes start pairing at

A

Zygotene

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B

Pachytene

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C

Diplotene

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D

Leptotene

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Solution

The correct option is A
Zygotene

During zygotene or zygonema of meiotic prophase I, the chromosomes become shorter and thicker. The homologous chromosomes come to lie side-by-side in pairs. This pairing of homologous chromosomes is known as synapsis or syndesis. A pair of homologous chromosomes lying together is called a bivalent.

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Similar questions

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

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 are doubled.

Q. Pick out the item which has sequential arrangement.
i)

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 .

Q. Pick out the item which has sequential arrangements.
a) Zygotene

\to

\to

\to

\to

Diakinesis.
b) Diakinesis

\to

\to

\to

\to

Diplotene
c) Leptotene

\to

\to

\to

\to

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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