Q.

Which stage of meiosis can last for months or years in the oocytes of some vertebrates? (NEET 2022-R) 
 

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a

Leptotene

b

Pachytene

c

Diplotene

d

Diakinesis

answer is C.

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Detailed Solution

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The oocytes of some vertebrates get arrested for years or months in diplotene stage of meiosis prophase I. 
(1) The first stage of prophase I called leptotene.
(2) During pachytene stage, crossing over between the non-sister chromatids of homologous chromosomes takes place.
(4) Diakinesis is characterised by terminalisation of chiasmata.

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