Which of the following events characterizes the Zygotene stage of Meiosis I?
Answer and explanation
Correct answer: B. Synapsis of homologous chromosomes to form bivalents
- Step 1: In early meiosis, homologous maternal and paternal chromosomes recognize each other.
- Step 2: During the Zygotene substage, chromosomes pair length-wise in an exact point-for-point alignment termed synapsis.
- Step 3: This paired chromosome complex is called a bivalent or tetrad.
Answer
Synapsis of homologous chromosomes to form bivalents.
Why not the others: Terminalization of chiasmata occurs in Diakinesis; Appearance of chiasmata occurs in Diplotene; Separation of sister centromeres occurs in Anaphase II or mitotic Anaphase.
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