Question: 165. Match List I with List-II :
| List-I (Sub Phases of Prophase I) | List-II (Specific characters) |
|---|---|
| A. Diakinesis | I. Synaptonemal complex formation |
| B. Pachytene | II. Completion of terminalisation of chiasmata |
| C. Zygotene | III. Chromosomes look like thin threads |
| D. Leptotene | IV. Appearance of recombination nodules |
Choose the correct answer from the options given below:
(1) A-IV, B-II, C-III, D-I
(2) A-I, B-II, C-IV, D-III
(3) A-II, B-IV, C-I, D-III
(4) A-IV, B-III, C-II, D-I
Answer: Option (3)
Explanation:
Diakinesis is the final substage of prophase I where terminalisation of chiasmata is completed,
so A matches with II.
Pachytene is characterized by crossing over, during which recombination nodules appear on the synaptonemal complex, so B matches with IV.
Zygotene is the stage where homologous chromosomes begin pairing by formation of the synaptonemal complex, so C matches with I.
Leptotene is the initial stage of prophase I in which chromosomes appear as long, thin threads,
so D matches with III.
Therefore, the correct matching is A-II, B-IV, C-I, D-III, corresponding to option (3).