Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The beginning of diplotene is recognised by the dissolution of the synaptonemal complex and formation of X shaped structures called chiasmata. Reason (R): In oocytes of some vertebrates, diplotene can last for months or years.
(A) is correct but (R) is not correct.
(A) is not correct but (R) is correct.
Both (A) and (R) are correct and (R) is the correct explanation of (A).
Both (A) and (R) are correct but (R) is not the correct explanation of (A).
'The beginning of diplotene is recognised by the dissolution of the synaptonemal complex and the tendency of the recombined homologous chromosomes of the bivalents to separate from each other except at the sites of crossovers. These X-shaped structures, are called chiasmata' . The text also states, 'In oocytes of some vertebrates, diplotene can last for months or years' . Thus, both statements are factually correct. However, the duration of the stage (Reason) does not explain the structural changes that characterize its beginning (Assertion).
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