Question

Arrange the correct sequence of stages of Meiosis I:
A. Pachytene
B. Diplotene
C. Leptotene
D. Diakinesis
E. Zygotene
Choose the correct answer from the options given below:

• A. C, E, A, B, D
• B. A, E, B, C, D
• C. A, B, D, E, C
• D. A, B, C, E, D

Hint:

Mnemonic: “Little Zebra Paints Dark Designs” → Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis.

Answer 1

The Correct Option is A

Step 1: Recall stages of Prophase I in meiosis.
Prophase I is divided into 5 sub-stages: Leptotene → Zygotene → Pachytene → Diplotene → Diakinesis.
Step 2: Describe each stage.
- Leptotene: Chromosomes start condensing.
- Zygotene: Homologous chromosomes pair (synapsis).
- Pachytene: Crossing over of genetic material occurs.
- Diplotene: Homologous chromosomes begin to separate but remain attached at chiasmata.
- Diakinesis: Chromosomes fully condensed, nuclear envelope breaks down.
Step 3: Match with given codes.
Correct sequence is C (Leptotene) → E (Zygotene) → A (Pachytene) → B (Diplotene) → D (Diakinesis).
Step 4: Verify options.
Option (A) matches this correct order.
Step 5: Conclusion.
Thus, the correct sequence of stages in Meiosis I is Leptotene → Zygotene → Pachytene → Diplotene → Diakinesis.