Correctly identify the stage of cell division shown in the given diagram.

Prophase - I

- It is subdivided into 5 phases :

$\mathbf{A}.$ Leptotene (Lepto = thin or delicate)

- Chromosomes gradually become visible.

- Condensation or compaction of the chromosomes continues.

$\mathbf{B}.$ Zygotene (Zygo = related to pairing or joining)

- Synapsis or pairing of chromosomes occur to bring the homologous chromosomes together.

- Synapsis is followed by the formation of synaptonemal complex (or bivalent or tetrad).

$\mathbf{C}.$ Pachytene (Pachy = thick)

- Bivalent chromosomes clearly appear as tetrad as condensation is in progress.

- In this stage crossing over occurs.

$\mathbf{D}.$ Diplotene (Diplo = double)

- Starting of diplotene is characterized by the dissolution of the synaptonemal complex and the

separation of the homologous chromosomes from each other except at the X shaped sites of cross

over. These X shapes sites are termed as Chiasmata.

$\mathbf{E}.$ Diakinesis (= Movement or separation of both)

- It is characterized by the terminalization of chiasmata.