What is the terminal stage of meiotic Prophase I, characterized by complete terminalization of chiasmata and breakdown of the nuclear envelope?
Answer and explanation
Correct answer: D. Diakinesis
- Step 1: Following Diplotene, the final substage of Prophase I is Diakinesis.
- Step 2: During Diakinesis, chiasmata slip toward the chromosomal ends in a process termed terminalization.
- Step 3: Chromosomes reach maximum condensation, the nucleolus vanishes, and the nuclear envelope breaks down, preparing the bivalents for transition to Metaphase I.
Answer
Diakinesis.
Why not the others: Diplotene precedes diakinesis and is characterized by the initial appearance of chiasmata; Pachytene is when crossing over occurs; Metaphase I is a distinct phase following the conclusion of Prophase I.
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