Question

Sequential steps of Prophase I of Meiosis are:
(A) Zygotene,
(B) Pachytene,
(C) Leptotene,
(D) Diplotene,
(E) Diakinesis

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

Hint:

Prophase 1 is the longest phase of meiosis. Leptotene is when the chromosomes condense; zygotene when chromosomes pair up; pachytene for crossing over; diplotene when they start to separate, and diakinesis when they are ready for metaphase.

Answer 1

The Correct Option is B

Prophase I of meiosis is divided into 5 stages that are characterized by specific events:
• Leptotene: Chromosomes condense and become visible under microscope.
• Zygotene: Homologous chromosomes pair up forming synaptonemal complex.
• Pachytene: Crossing over occurs between homologous chromosomes.
• Diplotene: Synaptonemal complex disassembles, and chiasmata (cross over points) becomes visible.
• Diakinesis: Chromosomes condense further and chiasmata move to terminal positions, preparing for separation.
The correct sequence is therefore Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis.