NEET 2021 · BiologyMeiosis IPrevious Year Question
Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?
Answer: (A) Diakinesis. Answer: Diakinesis Solution: Diakinesis is the final stage of prophase I and is distinctly marked by terminalisation of chiasmata, full chromosome condensation and assembly of the meiotic spindle.
- A.Diakinesis✓
- B.Pachytene
- C.Leptotene
- D.Zygotene
Correct Answer
(A) Diakinesis
Solution & Explanation
Answer: Diakinesis Solution: Diakinesis is the final stage of prophase I and is distinctly marked by terminalisation of chiasmata, full chromosome condensation and assembly of the meiotic spindle. Crossing over (recombination nodules) occurs at pachytene, chiasmata first appear at diplotene, leptotene shows initial condensation, and synapsis (pairing) occurs at zygotene. NCERT Reference: Ch 10, p.126, lines 85-86 — "terminalisation of chiasmata"
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