KCET · BIOLOGY · STD 11 - 10. Cell Cycle and Cell Division
The correct sequence of events in prophase I is
- A Synapsis → Crossing over → Chiasmata → Terminalisation
- B Crossing over → Synapsis → Chiasmata → Terminalisation
- C Chiasmata → Synapsis → Crossing over →Terminalisation
- D Chiasmata → Crossing over → Synapsis → Terminalisation
Answer & Solution
Correct Answer
(A) Synapsis → Crossing over → Chiasmata → Terminalisation
Step-by-step Solution
Detailed explanation
(A) Synapsis → Crossing over → Chiasmata → Terminalisation,
Prophase of meiosis I is divided ino 5 phases which include leptotene, zygotene, pachytene, diplotene and diakinesis.
Synapsis occurs during the second stage of prophase I called zygotene. In pachytene, crossing over (exchange of genetic material) takes place between non sister chromatids of the homologous chromosomes. Chiasmata are formed during diplotene. In Diakinesis, the final stage of meiosis I, the terminal is action of chiasmata occurs.
Prophase of meiosis I is divided ino 5 phases which include leptotene, zygotene, pachytene, diplotene and diakinesis.
Synapsis occurs during the second stage of prophase I called zygotene. In pachytene, crossing over (exchange of genetic material) takes place between non sister chromatids of the homologous chromosomes. Chiasmata are formed during diplotene. In Diakinesis, the final stage of meiosis I, the terminal is action of chiasmata occurs.
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