Question

Prophase 1 . explained. With diagram

Answer 1

Answer:

PROPHASE I

• It is the largest phase.
• It is divided into five sub stages.

1. Leptotene
2. Zygotene
3. Pachytene
4. Diplotene
5. Diakinesis

1.Leptotene

• It is the first stage of the prophase of meiosis.
• In this phase chromosomes are longest and thinnest.
• It is also called as bouquet stage.
• In this phase condensation of chromosome is start.
• In this phase assembly of microtubules start.

2. Zygotene

• It is the second stage of the prophase of meiosis.
• In this phase synaptonemal complex is formed between two homologous chromosome.

3. Pachytene

• It is the third stage of the prophase of meiosis.
• In this phase crossing over / gene exchange occurs between the the two homologous chromosome.

4. Diplotene

• It is the fourth stage of the prophase of meiosis.
• In this phase chiasmata is formed.

5.Diakinesis

• It is the fifth and last stage of the prophase of meiosis.
• In this phase terminalization of chiasmata start.
• Chromosome is highly condensed.
• In this phase nuclear membrane, nucleolus, endoplasmic reticulum and golgi complex are disappeared.
• Diakinesis represents transition to metaphase I.