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Prophase I

The correct s...

Question

The correct sequence of phases occuring during prophase-I of meiosis-I is:

Zygotene, leptotene, Diplotene, Diakinesis, Pachytene

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Leptotene, Zygotene, Diplotene, Diakinesis, Pachytene

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Leptotene, Zygotene, Pachytene, Diakinesis, Diplotene

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Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis

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Solution

The correct option is D Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis
Prophase-I of meiosis-I is of longer duration and several events occur during this phase. Hence, it is sub divided into five phases. The five phases of prophase-I occuring in correct sequence are leptotene, zygotene, pachytene, diplotene and diakinesis.

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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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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.

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