Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The beginning of the diplotene stage is recognised by the dissolution of the synaptonemal complex. Reason (R): X-shaped structures called chiasmata become clearly visible during the diplotene stage. In the light of the above statements, choose the most appropriate answer from the options given belo

Step-by-step solution

Both Assertion (A) and Reason (R) are correct statements according to NCERT. The beginning of diplotene is indeed recognised by the dissolution of the synaptonemal complex. Furthermore, because of this dissolution, the recombined homologous chromosomes separate from each other except at the sites of crossovers, making the X-shaped structures called chiasmata clearly visible during this stage. However, Reason (R) is not the correct explanation for Assertion (A). The visibility of chiasmata is a direct consequence (r