Assertion : Diplotene is characterized by the | vedclass

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(B) Diplotene is the longest and most active subphase of prophase $I$ of meiosis.The beginning of diplotene is recognized by the dissolution of the sy

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If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

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(B) Diplotene is the longest and most active subphase of prophase $I$ of meiosis.The beginning of diplotene is recognized 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.Additionally,in the oocytes of some vertebrates,the diplotene stage can remain suspended for months or even years,a state known as dictyotene.Since both statements are factually correct but the duration of the stage does not explain why chiasmata are present,the correct option is $B$.

Assertion : Diplotene is characterized by the presence of chiasmata.
Reason : Diplotene can last for months and years in oocytes of some vertebrates.

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Assertion : Diplotene is characterized by the presence of chiasmata.Reason : Diplotene can last for months and years in oocytes of some vertebrates.