Diakinesis and Chiasmata Terminalisation — NEET
✅ Asked in NEET 2021The final stage of meiotic prophase I is diakinesis. This is marked by terminalisation of chiasmata. During this phase the chromosomes are fully condensed and the meiotic spindle is assembled to prepare the homologous chromosomes for separation. By the end of diakinesis, the nucleolus disappears and the nuclear envelope also breaks down. Diakinesis represents transition to metaphase I.
Diakinesis is the final stage of meiotic prophase I, specifically marked by terminalisation of chiasmata—the process where crossing over sites move toward chromosome ends. Students often confuse diakinesis with other prophase I substages or forget that terminalisation is its defining feature. The key trap: mistaking when the nucleolus disappears and nuclear envelope breaks down. Remember: diakinesis = fully condensed chromosomes + terminalised chiasmata + meiotic spindle assembly + disappearance of nucleolus and nuclear envelope. This leads directly into metaphase I, making it a critical transition checkpoint that NTA tests for understanding meiotic progression.
Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?
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