Question

Identify the correctly matched pairs.
A. Leptotene - Synapsis occurs
B. Zygotene - Pairing of homologous chromosomes
C. Pachytene - Crossing over do not occur
D. Diplotene - Nuclear membrane dissolves
E. Diakinesis - Terminalisation of chiasmata

• A. B and E are correct
• B. B and C are correct
• C. A and B are correct
• D. B and D are correct

Hint:

Memorise the order: Leptotene → Zygotene (synapsis) → Pachytene (crossing-over) → Diplotene → Diakinesis (terminalisation).
A quick mnemonic: "Let Zebras Paint Dark Doors" to preserve the sequence of events.
Use the stage functions (pairing vs crossing over vs terminalisation) to judge true/false statements.

Answer 1

The Correct Option is A

Review prophase I sub-stages of meiosis:
Leptotene — chromosomes condense; synapsis (pairing) has not yet occurred (so statement A is false).
Zygotene — homologous chromosomes pair/synapse (statement B is true).
Pachytene — crossing over (genetic recombination) occurs here (so statement C "do not occur" is false).
Diplotene — nuclear membrane is still present; chromosomes begin to separate at chiasmata (statement D is false about membrane dissolving).
Diakinesis — final sub-stage of prophase I; terminalisation of chiasmata and preparation for metaphase occurs (statement E is true).
Thus only B and E are correct → option (1).