A : Chiasmata counting stage is diplotene.R : | vedclass

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(A) The diplotene stage of prophase-$I$ of meiosis is characterized by the dissolution of the synaptonemal complex.However,the homologous chromosomes

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) The diplotene stage of prophase-$I$ of meiosis is characterized by the dissolution of the synaptonemal complex.However,the homologous chromosomes do not separate completely at the sites of crossing over.These $X$-shaped structures are called chiasmata.Therefore,the diplotene stage is the stage where chiasmata become visible and can be counted.Since the reason explains why chiasmata are visible and countable at this stage,both statements are correct and the reason is the correct explanation.

$I$. Leptotene	$A$. Chromosomes appear as clear bivalents/tetrads
$II$. Zygotene	$B$. Chromosomes appear like a thread (beaded appearance)
$III$. Pachytene	$C$. Chromosome condensation reaches its maximum
$IV$. Diakinesis	$D$. Synapsis of homologous chromosomes occurs

$A$ : Chiasmata counting stage is diplotene.
$R$ : Dissolution of the synaptonemal complex occurs except at the sites of crossovers.

Similar Questions

If there are $4$ chromosomes present in Prophase-$I$,how many chromosomes will be present in each cell at the end of Anaphase-$II$?

$A$: In the diplotene sub-stage,the two chromosomes of a homologous pair move away from each other.
$R$: The connection is maintained at the site where crossing over has occurred in homologous chromosomes.

The enzyme recombinase is required at which stage of meiosis?

Which of the following statements is consistent with meiosis?

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$A$ : Chiasmata counting stage is diplotene.$R$ : Dissolution of the synaptonemal complex occurs except at the sites of crossovers.