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Cytokinesis

During Meiosi...

Question

During Meiosis I, the chromosomes start pairing at

Zygotene

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Pachytene

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Diplotene

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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

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.

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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	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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