Find the mismatched pair.

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(D) In Meiosis-$I$,Prophase-$I$ is divided into five sub-stages: Leptotene,Zygotene,Pachytene,Diplotene,and Diakinesis.$1$. Leptotene: Chromosomes app

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Formation of bipolar spindle - Diplotene

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(D) In Meiosis-$I$,Prophase-$I$ is divided into five sub-stages: Leptotene,Zygotene,Pachytene,Diplotene,and Diakinesis.$1$. Leptotene: Chromosomes appear as thin,thread-like structures.$2$. Zygotene: Homologous chromosomes pair up,a process known as synapsis.$3$. Pachytene: Crossing over occurs between non-sister chromatids of homologous chromosomes. Chiasmata are $X$-shaped structures that become visible during the next stage,Diplotene.$4$. Diplotene: The chiasmata become clearly visible as the homologous chromosomes begin to separate. The formation of the bipolar spindle typically occurs during Prometaphase or Metaphase,not Diplotene.Therefore,the pair 'Formation of chiasmata - Pachytene' is technically mismatched because chiasmata are the physical manifestation of crossing over that becomes visible in Diplotene,and 'Formation of bipolar spindle - Diplotene' is also incorrect as it occurs later.

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