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Diplotene

The prophase ...

Question

The prophase of reduction division is divided into number of stages. The correct chronological sequence is

Leptotene - pachytene - zygotene - diplotene - diakinesis

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Leptotene - diplotene - pachytene - zygotene - diakinesis

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Leptotene - zygotene - diplotene - pachytene - diakinesis

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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 of meiosis I is long and complicated because it is during this phase that crossing over occurs between homologous chromosomes. Prophase I is comprised of 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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5

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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