NEETBotanyCell Cycle and Cell Division
Events during Prophase-I Stages of Prophase-I A. Crossing over 1. Diplotene B. Synapsis 2. Zygotene C. Weakening of synaptonemal complex 3. Pachytene D. Terminalisation 4. Diakinesis
Options
- AA-3; B-2; C-1; D-4
- BA-2; B-3; C-1; D-4
- CA-1; B-2; C-3; D-4
- DA-4; B-2; C-1; D-3
Correct answer
A. A-3; B-2; C-1; D-4
Step-by-step solution
During the Pachytene stage of prophase I, homologous chromosomes are fully paired, and crossing over occurs. Synapsis takes place during the Zygotene stage of prophase I. In the Diplotene stage, the synaptonemal complex that held the homologous chromosomes together begins to weaken and dissolve. Terminalisation refers to the movement of chiasmata toward the ends (telomeres) of the chromosomes, which occurs during the Diakinesis stage.